Malicious PDF — malware analysis report

Static analysis result for SHA-256 83fe6752a2d3c2a1…

MALICIOUS

PDF

80.0 KB Created: 2021-09-04 01:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a97c6471e57a9a597352b555b6cc686c SHA-1: e7d580532c3fcb9e697b4bfe43571699e81dfceb SHA-256: 83fe6752a2d3c2a1d9c53c5a7b805b5e20559177043a517d99c67879f5aecdfa
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload directories. The ML classifier and ClamAV heuristic strongly indicate maliciousness, specifically phishing or trojan activity. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://trunglam.vn/uploads/userfiles/file/16269107379.pdf In PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2bb6c7052---21352271582.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/26908289771.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8228722de---tuzawafuzatabewimojigun.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/goravazijojoj.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///13697187778.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/vuvos.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a5ddd6503bb3fc2fa057346aeeff181f/63105194920.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609a805d5185d---93840645014.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/83f4a0be41022f05b18d0990dd7b1eb7/wogunuwizenivegi.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/zizimasexekavinukev.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/82202419102.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/38443842150.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb3bae5630---tijimebof.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/48790017383.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/66896383578.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/loxugutikaxodiba.pdfIn PDF document text
    • http://coinmarketsuite.com/ckfinder/userfiles/files/26428775413.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b14394ae2---ziriv.pdfIn PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/tipebo.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ded95271a03---wubasenawowarim.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/8or08ojbg94bk4r2vs4drg9cb0/luvasufakufamu.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/zoxudotuzaxa.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/mekerijunaledul.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/perejimam.pdfIn PDF document text
    • http://normandyclassof79stl.com/clients/e/e1/e16d7b8530e96d8d426d6b963c92b0b5/File/72520444997.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=elapsed+time+worksheets+5th+gradePDF 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_off0000d57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57D 11028 bytes
SHA-256: 9a4fb5f2ecb45a73745047815aebd19333a2ca72b842b45e53711111654e2341
font_01_sfnt_off0000ef05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF05 16740 bytes
SHA-256: e1ccf8cde71e73714653390ab93b2a4d8bd09181ce917f6a993dcd23e5d650e7
font_02_sfnt_off000119fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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