Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d2f26f2506fe17…

MALICIOUS

PDF

80.9 KB Created: 2021-09-04 10:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 3222eedef7d7d2ec40932945dd79a4c8 SHA-1: c0bd5aa413b4d52302f93ea2f3291c4ba7df48ed SHA-256: a8d2f26f2506fe17d3d00c40f7af663c7c003e147698f70ef9d10a3980979e36
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aad8f4cd6bc---8750993918.pdf In PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/qqvbhq2ip5jntrdqo089brgjnv/nowigudarurub.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c929ade7a---damubagafagerada.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/zemolabejefora.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/tokonufosugekazufu.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/f8352j5ebkhmhc7j2u9r3fq0tm/garitu.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/99967991733.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/mozawakujukenem.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/c8vn3cq2t4bnijfd24ho8fnso5/32970729251.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bc5fa6d33---16643731957.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/sezogekerugit.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/serapepokovapeneleviv.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/vofugetotefukijukevivaw.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c64836ea202---9857949993.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/o818a7pjp74ae6hvv91kibcgq4/50196822784.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/74296618825.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8df73ae7a---lajumetabizubu.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/ab1646e1104a2013c01075595952df45/85783038123.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/95510696923.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4ac059f17---kodamunuwidonaru.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/epapu63flh8tdiqoarbe2n0u3h/nefoxizuzep.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/radasovi.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/gawafajoboma.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/rasuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=jackery+bolt+6000+user+manualPDF 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_off0000d5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A8 17772 bytes
SHA-256: 93af0c9da0c22dfd18d8345b908584fc992ca160e27526a6d96d100bd8748f60
font_01_sfnt_off00010442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10442 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C59 11024 bytes
SHA-256: bb244047fc2e91ec491eb06cb64ff763a413d7a52ff1ae3d1e5e732e5f979629

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