Malicious PDF — malware analysis report

Static analysis result for SHA-256 a72a9a09dccd754f…

MALICIOUS

PDF

97.1 KB Created: 2021-08-18 22:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: baef33d4bcfd2fff3483409547f34370 SHA-1: 23547c9fd420a21098906705fc24e280d3bd6c3a SHA-256: a72a9a09dccd754f98ca8a7c01a143bfff0393fbeb5a56ff007fa31786b6ebbf
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, with the latter specifically flagging it as 'Pdf.Phishing.Trojan'. Heuristic analysis revealed it functions as a link farm, containing numerous URLs pointing to various websites. Several of these URLs are hosted on compromised WordPress sites or disposable domains, indicating a potential phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/43980947fc0c079a0426029920613b5b/xinenepunogexotu.pdf In PDF document text
    • https://knurussian.kr/DATA/upload/files/202108072351246181.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/8741295591.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/niwetunavo.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/d4510f8e69da6eb485f713d9b8061ee7/jukowevovekatobagaji.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/5a01a3655aff8387577a397f0a9bd4f7/sowoloxolupak.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/8c8b6cfa97ef89702f696d81e6d5d972/zigaduvejokudekezedoza.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/vivip.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/nigaluwogovisejur.pdfIn PDF document text
    • http://novichiha.ru/pic/file/94513940304.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/56b1674b6386542c8b79569c64823849/safikipo.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609627432498e---vijirelibogutitorori.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757d261bc66---60384797721.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/moxejajadow.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/84868085002.pdfIn PDF document text
    • http://carsonandchain-ip.com/userfiles/file/84410285202.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8d2004c08---74965810023.pdfIn PDF document text
    • http://adveotec.com/img/file/4746681353.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/51809557017.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8c56581cb---baxepixowirigidomuzedaki.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec2e0d6106---sujesitulasivakepu.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/erthi045tlrni919vkp3ki6g83/6464223251.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f79e03dcc5---52645547764.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/kixidosuxedojikudax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=buff+dudes+bulking+plan+freePDF 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_off000116aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AA 10840 bytes
SHA-256: a98fbdfdfb36e47c58e908ae048f4dcbc509d266acc1255e22535ba75c4abf37
font_01_sfnt_off00012f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F52 18016 bytes
SHA-256: 2230fa45a2ae8ed4cbad2dc5f2fdfbda76c56a91d28083c506e3f48cdb2042a9
font_02_sfnt_off00015e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1