Malicious PDF — malware analysis report

Static analysis result for SHA-256 309ad8880929c767…

MALICIOUS

PDF

81.4 KB Created: 2021-09-10 19:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fa305a7c25a99ba8174be33097e79e3b SHA-1: 91e19f286b09a779a18ce4a2c211056b20d46928 SHA-256: 309ad8880929c767cb7b64888c3757a5d5a404c17c9402e0aaff839b11d9dfa7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to direct users to various PDF files hosted on potentially compromised or disposable domains, a common tactic for distributing malware. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a method used to bypass gateway scanning. While no scripts were directly extracted, the presence of PDF-related heuristics and the overall structure suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://musicincw.com/fckeditor/userfiles/image/fituzejunivedut.pdf In PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/30100404915.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/diwupegigepugofinija.pdfIn PDF document text
    • https://sanidom.pl/img/file/rajiwi.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/20365608494.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/7affd24fcf615bf005821236cd3ae83a/12751606565.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/jukivasiliwuxe.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/madasifeju.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/xabotadumirego.pdfIn PDF document text
    • http://adice-area.com/pictures/files/97281138455.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/sunudiwazenonodazugo.pdfIn PDF document text
    • http://popeyebio.com/upload/files/godunipen.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/dedubepikojosakogovorefe.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133427c1dc3d---vamik.pdfIn PDF document text
    • http://knipia.com/userfiles/file/66823903673.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/2740999821.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138fda01ad60---83535319704.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/nirafobinu.pdfIn PDF document text
    • https://mimpidia.com/contents/files/46384471679.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/88250088721.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/velofezubi.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/mafaxanisar.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/kabanupix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=tekken+4+for+android+downloadPDF 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_off0000db3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3F 17308 bytes
SHA-256: 957767896ada013be739a3c251b4f4dfdb0602aa11071e22962cf4eee95b2580
font_01_sfnt_off00010838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10838 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001204f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204F 10300 bytes
SHA-256: dd2efda27a3ab834cbc8b402b532e9fc6d98e59355cb09c1e1742bbde4bea5c8

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