Malicious PDF — malware analysis report

Static analysis result for SHA-256 44ab305662d6a30b…

MALICIOUS

PDF

75.6 KB Created: 2021-09-02 14:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 96030ad03b471f863e77688ed3947b20 SHA-1: 785d0a674f7c7aace1fbb9951e49d56668ccc978 SHA-256: 44ab305662d6a30b249069554f1f1e6ffe0f2cf5aa377a8600c3aa2cdf225255
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the final destination and potentially track user engagement with the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://ambvet-trefontane.eu/userfiles/files/55614194557.pdf In PDF document text
    • http://spy-military-labs.com/userfiles/file/36809589804.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/77152721006.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/53fc21154e781e5e1dabc02e12a0c00f/vitasifemubuwexirazo.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073193e77e04---kabegexupid.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/dakonakodebenerexaxuri.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/namipapukupotujipujefer.pdfIn PDF document text
    • https://nitdgp.ac.in/uploads/userfiles/files/wafoxazagoxumanigapazavan.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/23482830946.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/15965825183.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/60974608408.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/88367950414.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/d6d7c0384d9a34f5e2ed8fe7ed08e370/23303810627.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/ab23c94288ef9e21b701f442beebf31e/fabivewa.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/9be3212acec77553d993365328822be8/luzamenurezepew.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924a1b84686---vutokikileruwosumopok.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/99492cba66f458bdfe5bc197547b63b6/bexitutanogasasonog.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/zizilipi.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/36476421773.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074665b215a2---fomevotupemigabe.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608127621093d---gufofob.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f064d1eef---45167953824.pdfIn PDF document text
    • http://fkhd.cz/data/img/vipes.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/ganusesag.pdfIn PDF document text
    • http://fygl.net/uploads/file/180855387799.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/xomavopazifuzef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=green+leaves+guitar+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_off0000c150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC150 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD962 17912 bytes
SHA-256: 04b9bd5dde16d104d2f6f34b87a10a97067dc05961a85af2ffa2f6abd5868a6d
font_02_sfnt_off000107d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D1 10756 bytes
SHA-256: 345461f89de0552ccaa517d19d34fc201287e5476b523c55c4395287cc471426