Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a2fd019a7837c3…

MALICIOUS

PDF

91.3 KB Created: 2021-09-17 03:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b7d452a99be6ca29e1136051424f48d3 SHA-1: 6f75a90461789ca5230af30261468b5f4bcacde6 SHA-256: 41a2fd019a7837c32afe3df1d45e4ceaf4e2d19cae9e85e33529d3eaa463a990
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs that point to disposable hosting and compromised CMS upload storage, suggesting a link farm designed to redirect users to malicious sites. The heuristic 'SE_CALLBACK_LURE' further suggests a phishing pretext, likely aiming to trick users into visiting these sites or potentially calling a fraudulent number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://allytemp.ru/uplcv?utm_term=developing+mobile+app+for+android PDF link annotation
    • http://bagiez.com/userfiles/file/13089469556.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/vibales.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/76670632583.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/65437110160.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/nujerapesazarazojat.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/zomusoto.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/refobisadoxigejukifuri.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/83497289203.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/sorurekekubakuriwoxe.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/gudaburilejomiverebepi.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/migufojulisuki.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/38979952768.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/nejanixiwibaguteninad.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/magomivagotukuvimazede.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/18317284687.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/In PDF document text
    • https://plasy.com/uploads/file/7951731796.pdfIn PDF document text
    • https://drishtinetcom.in/FCKeditor/file/mitobeke.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613362bbc0196---83354712810.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/fojilixonafa.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/51127323340.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1613041242cc4f---wuriresiviwevawajekip.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16132c83bacd98---tarujadogujekenu.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/10421897764.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/repukesodovewibo.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16143e29dd7493---linibarelitepafo.pdfIn PDF document text
    • 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_off00010014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10014 18068 bytes
SHA-256: 09b9b15225d95139a0e24c0432687a95382a8744d9439c5ddda172a01987209d
font_01_sfnt_off00012ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC4 10780 bytes
SHA-256: 87a46ca74cf29ae54f028eaab7c58cd1c10cb832cd6a0d246e988071affc9485
font_02_sfnt_off00014714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14714 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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