Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f15ec55229c3308…

MALICIOUS

PDF

83.0 KB Created: 2021-07-09 14:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 447716da6f021738bae9bcf3aad3a8f4 SHA-1: eaf401f66b9d56f48c926fde354c4ad8a62e00c4 SHA-256: 1f15ec55229c33087ce0ea63ded11a2566d3c00617ea4555e6a483d2a5da34e7
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other potentially malicious domains, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a phishing or malware distribution intent. The document body is heavily obfuscated and appears to be generated content rather than user-readable text, further supporting the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/c9cba3bb57ad9614ba2baabe5bc7ea0f/21610445599.pdf In PDF document text
    • http://womenscouncildallasarboretum.org/clients/85748/File/tikogagumidadabivitofenok.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/26793352025.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608059e813ce0---90048486784.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/ebd1a6b0c93d4787503ff31f6b303976/22028506165.pdfIn PDF document text
    • http://ahchala.com/img/file/899157249.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160874b15bf7ee---zapomomaxil.pdfIn PDF document text
    • http://allycatering.com/userfiles/93491251904.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c305a1047---84263012411.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/13d5b132e0d2f2c0c68dce4d50473030/12658717297.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b43f67696f8---14075237160.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d56e4bbd0b9---78564741564.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/511bf77f4a9da8b6f90682a3696d8845/depufowuxixitugova.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/co20ae4vuem489e3kbdtbn3658/53499691219.pdfIn PDF document text
    • http://cathayred-csr.com/img-cathay/files/wejawavefekerexig.pdfIn PDF document text
    • https://noblacklist.pro/web/img/podborky/files/14831358418.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160c0046baf169---nigopadadugisolupok.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/15b201794729b8f165c7689ed54474eb/26085671695.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c68e979451565be3d40752762c3c2a64/792202232.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/dexej.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/fuzupipetafimivexe.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/95571666919.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/59215352350.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdbd0481f6---83365570007.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b70ee3aa021---21939374009.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9572101de7---3187127066.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=nouns+worksheet+for+grade+2+with+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_off0000e08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08E 17276 bytes
SHA-256: b4629c0f3cd2544961fb54693711c406bbe1e60db433339a50104fbc3fad11dd
font_01_sfnt_off00010d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1A 10960 bytes
SHA-256: d79c141de360305657b526081b82977ef0e90e5e18d5123b729b521eada7893e
font_02_sfnt_off00012679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12679 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1