Malicious PDF — malware analysis report

Static analysis result for SHA-256 37e15d057c81e320…

MALICIOUS

PDF

91.3 KB Created: 2021-08-05 09:28:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 496e5051e4ac7c1f2d196c24deba03b0 SHA-1: 16dc358f76789d66a0c378db56ae0f0e5a42ffd8 SHA-256: 37e15d057c81e320cfd4c2e22c162e8e1d834f8b77632aeac8200066a29d75a1
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple websites, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing or malware distribution sites. No scripts were extracted, but the structure and URL analysis point to a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb41ce3eca---8705091012.pdf In PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b5aef0a71d1---85338883998.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/b298c9c87cf644d6f2fe7f39852a261e/15973242416.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/98651528819.pdfIn PDF document text
    • http://hillhouseclassof1961.com/clients/c/c9/c9b049383fb65e98d0a4dcab6c176392/File/wevipisobadurejez.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160764e2b52937---24460868536.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/36788960732.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/30443434682.pdfIn PDF document text
    • http://adlinefor.com/home/webagen/public_html/korn/data/file/54979755504.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/wixevudalejisojiwen.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/9992536409.pdfIn PDF document text
    • http://usateatop.com/_upload/files/benemuwom.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e9144797b37---jogisoruk.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e0690f75d---59241497519.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/fazotalo.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/75aa18d16b04912bf439b230063d6760/volurijolowojumaborul.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/puxefokuk.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/f4e8d0d3a5aa0f7a39ab490cc313d369/53940009696.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d76b3c2e6---zavukanenijabuvuvoxabak.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/muledirevijosi.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/28286862536.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/dofutireviwemopopizuzu.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fc48a7f06---tarasisan.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/idoitr2ces28r7o49e3rso1eju/53205286640.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/42195922124.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/vifimugotajulotonipesuna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=ver+novela+la+bella+ceci+y+el+imprudente+cap%C3%ADtulos+completosPDF 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_off0000f724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF724 11124 bytes
SHA-256: b3ed7a47b43d43208605d19dd0907c2f0a43fa1bc03726cdd9e5beb5e68dd1d8
font_01_sfnt_off000110d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D7 20132 bytes
SHA-256: 74381f97536c29fa01d022bd4849646895362b5ee06b018d0ff42850fbd85822
font_02_sfnt_off00014386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14386 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1