Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a737115a4cb933…

MALICIOUS

PDF

88.0 KB Created: 2021-06-26 13:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8ebdf2da6e9649925460c241fe6f8800 SHA-1: 68214f26a44fd019e93d734743dc1bbb2a31f61e SHA-256: a4a737115a4cb933677ddac1fbcefa6c7ce0beb9027e44a03c9747166e7cec04
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common tactic for distributing malware or phishing lures. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the presence of numerous external links suggests the document is designed to redirect the user to a malicious second-stage resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/107025246e6b52e58e18ccabbc4be924/famekadiwosul.pdf In PDF document text
    • http://interiorconsignments.com/media/file/27946808385.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/60397121287.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/db598581533fea924bbd7c94467944c3/75974000502.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/fopijezil.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/16308840030.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e1a729f2d---ragavozavufopu.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/c42s97ema1fsb1s4plr70i2k26/ditobanuzilesukarekolezu.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/80565746288.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/b0758dbc6ff8fd916971003158c35b28/57185093770.pdfIn PDF document text
    • https://chp-travel.ir/data/file/70980179569.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/c22647f04211b298cb0fcac337492be6/68358922644.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/04f654978def746512b3d1b496f57943/70685313209.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714787d3d6a---50879806467.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/400dd21378a80ff40e25d9b5f20a5979/99226667354.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/b2f6a48ae9e05d6cd96402840fcfc399/29699214606.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/8ab3b7843dd422c24973b4d9364c28ea/wozav.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/90613089565.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/63f511c8713cfd09d01c6cec1d1794d9/pepoludamuzosafutiweb.pdfIn PDF document text
    • http://bvsaigonbinhduong.vn/uploads/files/24325656874.pdfIn PDF document text
    • https://kar360.com/resimler/files/rutosegipiroti.pdfIn PDF document text
    • https://aashianarealty.com/file/zapaxajimegidotenakudefog.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/6a09891a7cf156e2e9ed1001fb7287ff/33554160792.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/281030074657.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=pathfinder+in+after+effectsPDF 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_off0000e83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83E 27716 bytes
SHA-256: 9ab0d6b161c10bf3763548568b3a3cdb4d36aaea3e7e8bedd3c7962af51283a4
font_01_sfnt_off00012159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12159 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13970 10408 bytes
SHA-256: a1699001c3e840382c0e51ccb23a7abda224de65fc8347e1590c0ad5bd6f9a62