Malicious PDF — malware analysis report

Static analysis result for SHA-256 31f90daca44398a2…

MALICIOUS

PDF

101.2 KB Created: 2021-06-28 15:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8794bcfbdce8a9bd979789c32ddf1a96 SHA-1: 4533911ed9052e8d75ba7de5500333d8d0648795 SHA-256: 31f90daca44398a27fdfdcbad55f67c35acee22d35ae80a46ce08b98262d87bf
176 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to various PDF files hosted on potentially compromised websites, indicative of a phishing or scam campaign. The heuristic 'SE_CALLBACK_LURE' strongly suggests the document is designed to trick the user into calling a fraudulent support number. While no scripts were explicitly extracted, the ML classifier and ClamAV detection confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://somsit.com/ckfinder/userfiles/files/menovuraxavikab.pdf In PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/5b617140a664b73325176790bc76beb5/bilamaguzabuzajezajugova.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/riwak.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071197721ee9---20536886665.pdfIn PDF document text
    • http://3q1p.com/upload/file/2106130056289785020y4gxnat7v27.pdfIn PDF document text
    • https://angkagenap.com/contents//files/gerekukexumadurulelon.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/zalop.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/9258if3ut1eh3rg4kj8outt0vd/89984752796.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/53010933687.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607056bb732c9---wevafonixavoxinaj.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160837ed8763ae---tozukikisodufimofifoxow.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/95349133065.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608538370e1b8---gitesibazej.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/a222hj2q2d1p197r1ejid0ov03/40942295522.pdfIn PDF document text
    • https://birudongker.com/contents//files/59111799447.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/vusovakep.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/bopuraw.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/s5j6teg26788lf7mu3b4v56stp/tanipizepajudidibu.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a59095bd3---xugumexiwedojazelurajo.pdfIn PDF document text
    • http://tipiland.net/upload/file/82988554258.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/sanovitonesujivobaz.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/439b39d4acf8ff637c69c0cd09998890/vibamedix.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6981bcf2b9---93862410917.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb7ef9698c---96716573003.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/9afbd51a0c92c2e682b40688c8e62246/vudiwego.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=city+of+ur+in+the+biblePDF 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
font_00_sfnt_off00010cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB3 19840 bytes
SHA-256: 0e0ad5d9db7636d75ffae17a7c9422384ac4d83d9624d278851d6840333e9702
font_01_sfnt_off00013ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000156bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156BC 10364 bytes
SHA-256: 5181727a93788ce10a839ee2e54e43b29f376b9665e0d0c8fe4be302057f0ca3
font_03_sfnt_off00016e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E1A 17040 bytes
SHA-256: d1aab35a99957a5ee4d75ebe56c5b40b4e023cb10369d4507bdce1f8a9438e45

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