Malicious PDF — malware analysis report

Static analysis result for SHA-256 2974482d80dba2f7…

MALICIOUS

PDF

95.9 KB Created: 2021-07-22 04:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b89f720753ccbde5b68ae8621f78be46 SHA-1: 52699c2050e5d56a736d8404e6bc049bdd2d6c46 SHA-256: 2974482d80dba2f7c076aadd6b8b5f89e5c44c7c57661c5a6c7c7b3adaccad12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the heuristic firings related to link farms and compromised CMS uploads are sufficient to infer a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/17754104467.pdf In PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/53719740423.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaf10958fe---jaboma.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c2971e65756---64282452853.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd58612a0f---17403422375.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/98e1c8b5ec1e484516379d7e74a48ff2/34844265543.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160afc221cae1a---jijojowujelokepobifosada.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078fb3435160---4269508972.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/61103815391.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/ig37ce9ot0r7hrgc70diqq5o37/22264966315.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/bn8funbfutdprjkp29iedp01e9/vuzesu.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/93993754135.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609269735d2d2---xofedimapiror.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e82914d920c7e7c466a765bb02008bbe/98476506601.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/8690305ce6eb203456e84f266e874db3/pujekobibomokis.pdfIn PDF document text
    • https://menu2uplus.com/images/file/lekebatunufexevopuzopa.pdfIn PDF document text
    • http://meadclassof1991.com/clients/c/cc/cc689d7a74a098ef67b43942063c7ff9/File/14805479587.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/95612017451.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb761c5a305---wesoxasedomiluxibixadex.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/betudevofugevetudoji.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160945f0194dc6---96438023996.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/1004de3c905e26debede0345fe9151f3/fexipigabapepabajetus.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/f0f6df0d55d179c2f2f7bade15ba7785/soxededuni.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/pidajoduz.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/vasotoku.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/mojizutamerodewagifop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=editing+exercises+for+class+10+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_off00011242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11242 17500 bytes
SHA-256: 26d309aaea123e9ddca05a6e20ae9ac13c42e997094de281810f88ab70cb6add
font_01_sfnt_off00013f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F71 11056 bytes
SHA-256: db8adfa023157f3ec48df1aad42ec8d74ccd9115dfba36e12d461ab954933d55
font_02_sfnt_off00015923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15923 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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