Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8dd888260030738…

MALICIOUS

PDF

121.3 KB Created: 2021-08-03 21:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d16e122f7fbd68e563533f626f648947 SHA-1: 078fd072038c7455f1e412db76ab8484d292d7fe SHA-256: b8dd8882600307386dba58622c6ddc52013cae60111f31cda8ae2cb12f7839b6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains exploit code or phishing content. The presence of numerous links to compromised CMS uploads and disposable hosting suggests a link farm designed to distribute malware or redirect users to phishing sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest an attempt to exploit vulnerabilities or trick users into downloading malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://americasbestmanassas.com/uploads/files/pojedimisavaf.pdf In PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/45f82f7e764923f4d91cd38316461e84/12338242934.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/03cb3bce23576f6d0b5473618a9f4845/96581124187.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/4o1cdld8eu3pl5ilerg3b24vl4/vipufikodidumu.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/robunosewerel.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/a10eed6983a64b6373ec28691a62cdfa/49094570533.pdfIn PDF document text
    • http://hphs1958reunion.com/clients/47465/File/fapamika.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609272f0710f4---7817538676.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160736a9743aa4---49034800435.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/90102338668.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/87483170270.pdfIn PDF document text
    • http://moodyhighclassof70reunion.com/clients/2/24/24f6aee67edc386a60746049a176a33b/File/36181106900.pdfIn PDF document text
    • http://wych123.com/upload/files/nowulanefapufesado.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/73994827186.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/razegi.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087367acddb8---30871429714.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/tibakirewolor.pdfIn PDF document text
    • http://iccarrentals.com/files/file/22444984913.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c24544496e5---tukidanumidudipeberurez.pdfIn PDF document text
    • http://azizolace.cz/images/file/85900337600.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ae6f6b837---3500883987.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/ddc294579785f035fe6ad53a320cc77e/45802921316.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/2sdek94dh0lk3ihs1e7842rd7h/78848061315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=spoken+english+urdu+pdf+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000148f4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x148F4 26272 bytes
SHA-256: a17f20590cbae2c335769f8e1966e781814faf90587d4924dfbb0b7812055962
font_01_sfnt_off00017659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17659 17428 bytes
SHA-256: 94cf0c3da73d3f00a1b32301f20118bf60696f8665bda614c072e521242dd57c
font_02_sfnt_off0001a34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A34D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001bb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB64 11032 bytes
SHA-256: b3fb09fe2196d574da0b48c4b71fbecdc51d37f146464868f39e63ea248c20c2

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