Malicious PDF — malware analysis report

Static analysis result for SHA-256 53068b0f015a5e95…

MALICIOUS

PDF

79.0 KB Created: 2021-07-29 20:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d92835b9745607ffff1fa916e445da7d SHA-1: 2441b5dc9f49f5cbd3af9750e2d34157d11bebef SHA-256: 53068b0f015a5e95e36504b9fc2c0f873ad472547203cb219f975a440802e1f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised CMS upload directories, suggesting an attempt to lure users to download further malicious content or engage in phishing. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787f86a3623---69511735118.pdf In PDF document text
    • https://acrgroup.nl/userfiles/file/20027325589.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/69156980283.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/c3550503a8188e1a2bc565ec773487ac/49460248402.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd6ab74bc9---jadabafejulomifirujutuzi.pdfIn PDF document text
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/sineteropolelejapefata.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/bamozokunos.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160fc6cf8c533b---48285078557.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f8df6a475b3---sonebotewumewemazow.pdfIn PDF document text
    • http://ithaca1962.com/clients/41687/File/36639116428.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607166b6d3e41---61938737944.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/4320810ca4b8da663c59a0c4c045da1c/javifafagerisumovusurasef.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/69933939787.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/86659825544.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cf900379c2c---93780676832.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1b8c8d2fd---49989457274.pdfIn PDF document text
    • https://thehero88vip.com/ckfinder/images_store/files/2953130373.pdfIn PDF document text
    • http://lueckerreunion2020.com/clients/e/eb/eba09433058400eda594a485f9004317/File/56927567037.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/e26b5a67879c11c537fc0a5651478946/kujetapabezuxepuripaf.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/fopigevuligomiru.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7ca74d002---60099399651.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/5af881a4a86776c060b0bd05d35c0337/tuxoliwokelodojogakuvo.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc7539c0eb4---xusavefekulirufasolid.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/pagus.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/wimem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=vertebrates+and+invertebrates+ks2+worksheetsPDF 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_off0000ce40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE40 17708 bytes
SHA-256: 8ef5863f79792fe96b183fff1ca870ed255375b792a5b07512a0ea076a799e6f
font_01_sfnt_off0000fb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB66 10772 bytes
SHA-256: 6c64400f36eb5a7adef4b8b4d61fa0b6ebd98922e7a69cb3914e0579282c877a
font_02_sfnt_off00011444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11444 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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