Malicious PDF — malware analysis report

Static analysis result for SHA-256 512879ad8ceb9795…

MALICIOUS

PDF

133.6 KB Created: 2021-07-05 10:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a4ff5cfbc75e86992bcf3e9a725a2c00 SHA-1: 6c27c5925917c94bcd3e382035fbb816dd8ca97b SHA-256: 512879ad8ceb9795d3f3cb6758700547ea82d4b22a503789c5ee54e5320b3b95
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains, which are often used to host phishing pages or distribute malware. The presence of these links suggests the document's primary purpose is to lure users to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9768

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/d3430beb7dd863a7536258c5d4309d20/13330122173.pdf In PDF document text
    • http://galluccifaibano.com/userfiles/file/34372640517.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160741ca97d916---nitofoxa.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/7d543016cfe3bad6ed7db57a75fee168/93523090905.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9f56cac1b---80493908596.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/b8cb91378fad2f7c154bd6e4686b9e7a/97583949523.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/44891045788.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/b48ce13ecd830ecbe6e9a89da45d5c3f/jumuxiluwudupabarikurigik.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/semorogizesosipusiboliba.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/47714887683.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/bkl7l1ebuuh6tktp6itn37vd62/vekobevojas.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef6c640355---1929411451.pdfIn PDF document text
    • http://atek-ent.com/upload/file/13761146217.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/rvda5bd0hlk1mjejnl7n1ujmf7/42927554998.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/27201kdd9cfkaj066nf5ri9480/72575223115.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b80aff4c3b2---33049679329.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e0935563---24137423734.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a260706acdf---32759928956.pdfPDF link annotation
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/fde9d8d7d2cd6202033dff7e8ad3d955/47458283559.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/57215259499.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/9d5k5k751ehmbih00kku5ta312/47788011.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ada050034fa---76601484422.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-2/20210502224525181507.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/fukuwalise.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607908932faac---78798922128.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/jn6g4nmqjnf4l5423hrg8h001f/76024169547.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=way+to+success+10th+english+guide+pricePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A831 11172 bytes
SHA-256: d327f951b57338eb678bd9e14327bac086e0645c0777a8172f9624d530bf65f9
font_01_sfnt_off0001c224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C224 17876 bytes
SHA-256: e7a362ffa6836fda63de5c78b3d23dce373dd5655fcef0df078bb478ad99903c
font_02_sfnt_off0001f07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F07D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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