Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1d7877475b10670…

MALICIOUS

PDF

88.1 KB Created: 2021-08-29 14:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7b66c96c164a663a8828e62ae708d2ba SHA-1: 8de84c5a4299ec953c343f33d9f29ed6ba50bb9f SHA-256: d1d7877475b10670684a14a39a91cf96dfda89554602d54430356c8fd894c3c2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to various compromised WordPress upload locations, and contains a callback lure consistent with phishing or tech-support scams. No scripts were extracted, but the presence of multiple external URIs and the callback lure suggest an attempt to deceive the user into initiating contact for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://perfecthospitals.org/FCKeditor/file/48974501763.pdf In PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/2b7d8d4464771155dad7dbd7ea7a4380/vilipujunezufetupaf.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/oes78apel4jel1f15jvb5iafb4/kasemasojitewof.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/69098320662.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/00df95c912d1ae07a8e1f73b77e11674/58174454780.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/3f0af7914419ab870084bff84929b4a9/41310316753.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/55703349789.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/8h2ug85n5l9msrmel18pk4urtr/soranise.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/3fhofu784jffa7q0l3s4ng9747/15400821234.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e04957e790---84312513144.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/lujokiminiduwupos.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/16045039764.pdfIn PDF document text
    • http://beiks.info/public/file/wavafowite.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/kedevimetodoxedeje.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/5a46b40003836b40253ebef9512ded8f/fogunekivadezarexujosog.pdfIn PDF document text
    • http://kurdumovldpr.ru/uploads/files/3043491061.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/8b488bjpofgqeu8t5jd4j7d1bg/78471695988.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/10712442594.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/7250498561.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=citibank+brand+guidelines+pdfPDF 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_off0000f1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B2 18776 bytes
SHA-256: 9d2ea014157e007310ce6ecb496b5d1c34be96d0248826682d52ad2834d2a811
font_02_sfnt_off00013a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A21 10916 bytes
SHA-256: e9c5f81c327ad172a4a2b83b1c112e303d1799dd39555d7a3fde94d2cd96bbfc

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