Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a8e81229c8c7ef7…

MALICIOUS

PDF

90.4 KB Created: 2021-09-08 03:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 53773ebcce3c025f6c7ba83a5c487e3a SHA-1: ba6f210c259731ea6455b9c0edb204e5a1458171 SHA-256: 9a8e81229c8c7ef75e1fb982f2d9782793194e8087e3b2275e2ee0f3ea3f7ead
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting it's used to distribute further malicious content or phish users. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://huntic.ru/uplcv?utm_term=titratable+acidity+of+yogurt+pdf PDF link annotation
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160817e8c95735---zijaperujebenoxufunopa.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/418e345fab7ab7bde95a8824ae6d4dbc/pefilipuzobeper.pdfIn PDF document text
    • http://premiumdrinks.eu/userfiles/23801263216.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/11119810579.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/99547330012.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/a191da3f8e608e289483e824211f927b/fazekibudupisebijidi.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/gipite.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/padalukexe.pdfIn PDF document text
    • http://splogservice.ru/content/file/77577573164.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/78085431793.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160983685042a8---42884156398.pdfIn PDF document text
    • http://bakoca.hu/files/file/17134713595.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents//files/65572920606.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/g3cjsagq4t46pk9kq1g3rgkmeb/72745715588.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/imvl7qa1183i7rb911c51i2f94/30633779810.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/12980778127.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca86d4e979---9921057256.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/64d416ca573644b89fc5bfead23293e3/21277477366.pdfIn PDF document text
    • http://mesterek.net/tmp/79076425628.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/baneneliwofalu.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746dc5ae6aa---vagaxemirifabesamamidi.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093db859f8f7---45941711114.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_off0000f8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A8 10840 bytes
SHA-256: 5a5207d38f10a0c0d02b67b416a54ef523faea0f01e1b6b434a5951546a4e4ba
font_01_sfnt_off00011171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11171 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12983 19580 bytes
SHA-256: e9f6963c7d178175afe75f38c3d01617df3c992eaf8cd61c5888a55fb8faa0ca

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