Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c89d6881d07a5be…

MALICIOUS

PDF

101.2 KB Created: 2021-06-29 05:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 828b1455db1973e342482312fe94a845 SHA-1: 64d8f90a529da7ab244651bc863f503bc6b568f4 SHA-256: 7c89d6881d07a5be3fe214cde1669e83edf0f0eb98246a3d294f17602c864fce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress sites, suggesting it is used to distribute malicious content or redirect users. The presence of numerous links on disposable hosting and the use of UTM parameters indicate a phishing or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9787

Heuristics 6

  • 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.
  • 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://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a861d7c7d8---kifanuvilunibagipot.pdf In PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/j544lgod8uk8dmhjuj44434qhm/29402104977.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f89241a238---63864962837.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb91184f58---38466477451.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/62c119b522c47a71236b6a1e643abce1/vumutadiwivol.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/baxefepudafubipibulomed.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/79865494804.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/8e53e8fe5263c93cbed88452b49b3666/77188714627.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/1c6c600039e43d4a743d4a4da3ae543e/46739032561.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d64816f29---nigalufafasudikak.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed3b3ce259---xojiniveta.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8473da93b4---85814248986.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090cde78b44c---37823131317.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812e4cee0e0---59174550660.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b17e4a1c0---79687293309.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/bidodegevibemuka.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/6565f756767adb8bc2e1ee413d5be3cf/20383817000.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a756ff7f877---puwetupidexeru.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/jiwavuxigomufuliwe.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/32960132102.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077b71c2d1dd---gopagipimuzomegefitanobe.pdfIn PDF document text
    • https://campermagazine.tv/public/file/kajut.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3556da19c9---vukotegimufamogolara.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/defefatokelixi.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/416a41a8e06b549a300c5bf220481def/xejobenadiwipumanari.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/vadexupopuxek.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/d6867523f93323c6a549f79b32afb96e/dibosuvenamofopokapib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=ap+statistics+2002+multiple+choice+answersPDF 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_off00012760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12760 17440 bytes
SHA-256: 7b29eac7105d78844917296238165e028385069e24b9c6e0aa09738d52a2b687
font_01_sfnt_off0001551f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1551F 11048 bytes
SHA-256: a2d62e40e8292430f82a59d8316bd53a903b0713c4d3268b2c31c84496a84769
font_02_sfnt_off00016ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ECE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1