Malicious PDF — malware analysis report

Static analysis result for SHA-256 e880a9350f0db07d…

MALICIOUS

PDF

82.0 KB Created: 2021-09-06 07:34:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9376c0099968cd2edd15d4ad9e55f6e5 SHA-1: 8e20ea23223eb8cc1a194a9ad001e36dd933eec5 SHA-256: e880a9350f0db07df599efa03d96a1b93b8b71803b73affedaf72309f14e6a9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://learningkey.org/userfiles/mivojizufopizapuripifus.pdf In PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/9chv1up9uq1npkaev6ocedg46m/46361861823.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/lvhabuvj4plun1vpgjpf50tttl/8291338972.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/jaguwutegad.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/67ef30e19f7097d99a25ffd7e33ffc41/vekozitenegidalozaxutoz.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1620627794.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/dekowujupuvap.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210805215037.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/kinigovekozupif.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/21376046520.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/mogapisiralululafito.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af99d88dfac---58289810867.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c637dc52db---silajewibibujuzixe.pdfIn PDF document text
    • http://airsoft1.ro/files/file/wawazif.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/6ffa890e0182a929faad0f41055ae328/73030347358.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/namunapufajafevoxozoviv.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160909d122f80b---kosoripomixivovu.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1a7d6d341---godekadosowotob.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/76026859779.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16093270f17d7a---51044317809.pdfIn PDF document text
    • http://bluefield1966.com/clients/26642/File/49596997216.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=digestive+system+test+grade+11+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_off0000db85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB85 10804 bytes
SHA-256: 732a0e449ea3addbc71c858b9471997ddb8d17374fc1dd16d2cb0ae15b2c19e5
font_01_sfnt_off0000f45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45B 17652 bytes
SHA-256: 94e12e1023f13b1920eddf1ccdd422c8f69b617813ea6160c7acfe77e85d0fb4
font_02_sfnt_off00012245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12245 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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