Malicious PDF — malware analysis report

Static analysis result for SHA-256 271321eaea0c0658…

MALICIOUS

PDF

86.3 KB Created: 2021-09-06 16:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 74856625df3816882ae272d94411ff63 SHA-1: b2f867c1c8eeaa6dc754e4cd823d79946360a93f SHA-256: 271321eaea0c0658ae72208b26500ac55b307cc9f63ad13fc4588c93ea295796
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many URLs pointing to potentially compromised CMS uploads, suggesting it's used to distribute further malicious content. The presence of a callback lure heuristic also suggests a phishing or scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16117ee58ea8bf---84063583898.pdf In PDF document text
    • http://ghalemdi.com/userfiles/file/39817836973.pdfIn PDF document text
    • https://12shio4.com/contents//files/bolomej.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/8cbb219d5cbd6f3053efc5cf5148358c/74521677195.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/jegoduremidatevadubobe.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/zupalev.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/78670203728.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1ba4ce79f---86492663413.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f76f562a14---koxekasamopoburefewox.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/68357868933.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/sejufuriziguzafejokixafa.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/97606581962.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/sefipunowiwevixuwulidoji.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/65505725693.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/38isosg8efajdt23eujuolo7ul/wirojedavubov.pdfIn PDF document text
    • https://aurorabersinar2.com/contents//files/jivukonaxufopilam.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082fccd63e51---85292823650.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afe36de9ff3---65843141852.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/xonamomabazome.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bbdfba8a0---52061477389.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/12f2cd4637cf385d2d375ab7a847001d/91040749410.pdfIn PDF document text
    • http://csavarkompresszor.hu/userfiles/file/75277056057.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/mucfp6jbue1mvkgpjd54krn9oa/69017181094.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebaf4acd90---nugizilufikuve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=research+methods+in+anthropology+h.+russell+bernard+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_off0000e8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F6 17932 bytes
SHA-256: 60d7588d89d5ea4c283091ab7b8ff5a8acfa152ed2a760617dc9d40fc6fd8348
font_01_sfnt_off00011790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11790 11532 bytes
SHA-256: 0331150e1a3ad4476127e73c12cefcc0267a8ea24cdb9512522472d946230cdd
font_02_sfnt_off00013254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13254 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1