Malicious PDF — malware analysis report

Static analysis result for SHA-256 af008aa329dfd62d…

MALICIOUS

PDF

83.8 KB Created: 2021-09-24 09:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 79da89dda5bd52ff01762b64c379157f SHA-1: 15925df24eee79941747452331805504a140b627 SHA-256: af008aa329dfd62dbf9ba758e0ae4726d39a38f2e6ecbf897856a397617b37e4
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics as malicious, including ML classification and ClamAV detection. It impersonates the UPS brand and presents a callback lure, directing users to a URL that does not match the brand. The presence of numerous external URIs and a link farm suggests an attempt to redirect users to malicious sites for credential harvesting or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://medvor.ru/uplcv?utm_term=us+foreign+affairs+department.
  • 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://medvor.ru/uplcv?utm_term=us+foreign+affairs+department PDF link annotation
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613094231b6cd---tosifemigakuwagokikuti.pdfIn PDF document text
    • http://sushi-belovo.ru/files/tekoze.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/23143016273.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/rusasagijobezurifaguroma.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/67133248541.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/setotisegi.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/mojebelenevoxumifuperewux.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/miditeja.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/katinori.pdfIn PDF document text
    • http://mayjack.com/upload/files/migiwaxemis.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/22480206840.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/wenekoxurazixupadi.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/xudejezanawewilozotonite.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142bbebc433e---32324630742.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/85630386623.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/11274951576.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///rununepavufafutunoponesa.pdfIn PDF document text
    • http://ruihuitax.com/files/file/64431856533.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/renupadubusenemudateba.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/60219753718.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/ed2352769d8e48374a69516b71d170ac/kuxonomuvewidakofula.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/161364c4bea5f0---6399183835.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/c0421820c8849af1980685cd81be5142/tobifupepadetupofiw.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec5017f2c2---vafebuv.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/18584403605.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_off0000e336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE336 17624 bytes
SHA-256: c4c382dd966359f3d3506ad305ddeaf6e85b6590243f6d0779d189633eec1fd3
font_01_sfnt_off000110c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C1 10804 bytes
SHA-256: 1a3e7255b3d47222467d16f83529baad360e4624bdecb0f6de037b2dca359f9e
font_02_sfnt_off00012973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12973 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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