Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f74fc3fef181fc6…

MALICIOUS

PDF

75.6 KB Created: 2021-09-14 11:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 90b9ba48d320de9d6e875a05591aeb27 SHA-1: 96aadd9f8a1a15786257b9a1cbe3fcca4d487d0a SHA-256: 8f74fc3fef181fc6c0251c962234ac4a887ab64f5be58ea0701c963c29528a94
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous links to potentially compromised websites, suggesting an attempt to host malicious content or redirect users. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards malicious intent, likely involving the exploitation of PDF vulnerabilities or social engineering to achieve its goals.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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) 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 https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/218af71c59806fecaa551661c60fbebd/16596300684.pdf In PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/pagunalurulurozulafi.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/gidotumugudafadisezumi.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/47471050224.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/12822489935.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/37028105817.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/fademunodebeb.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/wanusopefi.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/voviguretogakenekebumolud.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613429572f208---30112959846.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/49026107601.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/89971990550.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/56514262100.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/30674678453.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/bominaweponufujobigonupu.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/tanoxofabikimezik.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/golojilovinabafefipul.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd74841567---62047807207.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/nisebotabuv.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/funupezopujulibamago.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/98548351324.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/81375114237.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/12832400553.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/48444347085.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613180bbe8f75---kilegonisuru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=apollo+music+apkPDF 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_off0000c3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C7 17564 bytes
SHA-256: b7d8c9a5eb50493e350d5cd9af68fdf9776b1e3d50ad1b9fe00b1fce7e5c9218
font_01_sfnt_off0000f185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF185 10272 bytes
SHA-256: f1dc835d0bb648d90fd2894bf04224354866799570db712848550baa000e7e45
font_02_sfnt_off000108b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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