Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb7f4fa84b76415…

MALICIOUS

PDF

91.9 KB Created: 2021-08-02 23:35:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2e21932707d1cc31bb2cc987939cbbc8 SHA-1: 0aeeeab19de053bd41a5dcc927b3e4019d60535e SHA-256: 7cb7f4fa84b76415feaa4e3e1284c968c192e9c0f5803af7d5b9631e988f3d3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple compromised domains suggests a broad campaign to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://asbu.net/uploads/FCK_files/file/numebupuzoj.pdf In PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/16425183567.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/34835900554.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879ccfbe52c---sexasagudominadunitagib.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/ebd8710c1bad21ac52949f90d517ab45/71730039001.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/bodexezozigijaniv.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/31634949054.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/4a56a2a25ea766fc435ac2d3181c31da/76636228609.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/29576263239.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3119daa3d0---luludevoganinon.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/sojefefovibawez.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f054290658---62060154215.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/1e09fu8r84s3d2245bua9v7lnu/gakurowujikagomavor.pdfIn PDF document text
    • http://senn60reunion.com/clients/876260/File/nijotedesafetabilaf.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5add06a301---61139881500.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160719aa7eb4f7---71007487756.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/85822249238.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/57831540192.pdfIn PDF document text
    • http://falerisztika.hu/tmp/gagilufixunelir.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/8979589113.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/zasuga.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/d79ogjlio251srqqr315us96i0/20473879403.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/zokixegikofanujofopara.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/wugasize.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/nejemux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=read+gravity+falls+journal+3+online+freePDF 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_off0000fec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC0 11156 bytes
SHA-256: 384785cbe8fbcb821cf19068efb140263423b352213936caa16b4cae18a6b116
font_01_sfnt_off000118bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BD 18136 bytes
SHA-256: 16a2d989745afdfc1bdfac984b85824d48581666aaf1456cb72bed22cdfb0d9f
font_02_sfnt_off00014815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14815 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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