Malicious PDF — malware analysis report

Static analysis result for SHA-256 677b9ab284c2277c…

MALICIOUS

PDF

85.0 KB Created: 2021-07-04 14:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c97aaf137ce8385751575687f788fdc3 SHA-1: 6610398d05850a9150d242b4f01738f4ed731321 SHA-256: 677b9ab284c2277c82643569e656450d83ffc637178798de25aa554de144c756
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic findings point to a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://laborke.ru/uplcv?utm_term=find+the+lcm+of+3+and+9 PDF link annotation
    • http://bhs-class1957.com/clients/35434/File/81116717581.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/26fde3d00c476fb9b74930505e03672b/80198179079.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/rutafeguxinawamul.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/tifmnvo4ffljmqhm7a7niqldh5/80294915294.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/ec9297396935ebaf4f53f6f7789d3927/79425740038.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/wuwosejeginagitoleko.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/pakopuw.pdfIn PDF document text
    • https://jetaime-shop.com/files/93175581709.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/3b75c5a7e33af8acb7b22d460030e8da/kovezim.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/fofaximatiwavofulovunoxe.pdfIn PDF document text
    • https://fivetc.net/uploads/files/80272346579.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/40755718677.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/xudewexerudas.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/af579bf1e6be1556970f89febb8e6f48/11970071977.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/89507007433.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/dibiloludikozezevugenag.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/72169589369.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/nuligajid.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e90d382de6---xakux.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609871ab06a4c---titarapobepumukazili.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f61aaa0fbe---18563695928.pdfIn PDF document text
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/41628079472.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897d6b2ee0f---pamokuxotofiwonitor.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/b8h31ch98h1im6geoq5ftfqod1/soleferem.pdfIn PDF document text
    • https://sbufficio.it/file/89970129461.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45C 16780 bytes
SHA-256: 6b224cb7b574dfa20f9a0e49b8bee9f3e07bf3162c12882cd929fab29e33825a
font_01_sfnt_off0000ffdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDD 10788 bytes
SHA-256: c8ad21e8ceb787dcf8dfc47a33d9e703cc08304f8e9ccda57a0a091a43ae664e
font_02_sfnt_off00011876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11876 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_03_sfnt_off00012e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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