Malicious PDF — malware analysis report

Static analysis result for SHA-256 d274b557aad7a83f…

MALICIOUS

PDF

88.2 KB Created: 2021-06-28 04:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d0f2635ca0bb247b8853a29284d62d45 SHA-1: 02c75b3cd0e71d6611f7f7d9ff007ddf234d419e SHA-256: d274b557aad7a83f846f25440a28fb83c59b4fb0e0bf3cccd23bbd4d05c6f33a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm hosted on compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded URLs point to various compromised WordPress sites, likely serving as a distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://edgecs.net/documents/zivuzotifiluk.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a021bb912e---34302213076.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cba03f416e---83804499849.pdf
    • https://irepairplus.nl/app/webroot/files/userfiles/files/79650448597.pdf
    • https://alarrabnews.com/images/content/content/file/96292107054.pdf
    • https://iringmalaysia.com/ckfinder/userfiles/files/87525402592.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2115718204---43918005627.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e991b406d1---rubifurodewapujisur.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/687205a105c1aba64a752f45d67256f0/xutesofapatu.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/1943da70ea545edc3814b81d1298cd20/vudilupipafap.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851c5eda924---lakimivaviwazomep.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/605f6f46f8066cc5b56fe1377123e123/juritikewiboxonuxofuxunot.pdf
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rufijijofi.pdf
    • http://majorpropertygroup.com/userfiles/files/92688750372.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160830118024fa---72561596818.pdf
    • http://thietbixanh.net/uploads/files/lunarotepaju.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/3ef5934cf7f16e628ab94d8dbc2bc167/tubevogelilexomifomek.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd41d4379f---63193356814.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/4086a70ce0535b01c0535c6644e3a41b/64803605855.pdf
    • http://webinaris.net/ckfinder/userfiles/publics/files/18085313946.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16070f30cda7a5---sirikikobasoxatado.pdf
    • http://komputerzagrosze.pl/userfiles/file/gujobudewaxolomopunonajo.pdf
    • https://eravukappalpalli.com/userfiles/file/68414218801.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/44epd5uctodr3i3l89ruurentq/kubonovapiloxudada.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=grep+and+grep
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f450.bin
bb34abe38bcd3d213a2ea76370d7ecb8ee0126629b7654a4ed71f77300dd6052
pdf-font-stream PDF embedded font (sfnt) at offset 0xF450 18584 bytes
font_01_sfnt_off0001257c.bin
8bfd35f1e6690e86b57115b3b90514c991ddd6950586818a3705ae1a38f88550
pdf-font-stream PDF embedded font (sfnt) at offset 0x1257C 10084 bytes
font_02_sfnt_off00013bc6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC6 16792 bytes