Malicious PDF — malware analysis report

Static analysis result for SHA-256 558cce19e938b315…

MALICIOUS

PDF

88.9 KB Created: 2021-07-31 22:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2c77b7a3b06ae2d6b0bfd12c54dd45f5 SHA-1: ccacd93b5f4169b3217e4fc92e3bc4f92b36ef18 SHA-256: 558cce19e938b3150fc408d44ae31c3723d00aa2439d40e5e0e885d03ff0bd26
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of numerous external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/eddce6db82aa4e506b1d1d27fed66b52/tesusavevorabalawefulukud.pdf In PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/f6tu2tcr373988biqbq7urlk00/20871718304.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/7259d514059d847615b292fa0e4a724d/tusur.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/51246420402.pdfIn PDF document text
    • http://watch62.ru/files/files/fuvubuxoxuwevajuvimulogud.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210528082936.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/kasovapivisafegekuverelim.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c3abd88752c---tepovujodoz.pdfIn PDF document text
    • https://qkon.ca/images/file/vefizasebiwi.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/28630727629.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1608a794170f98---93931594802.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/76364497801.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/ecc30b69cf9b697d67c3850862e27f3d/vofojunokeniraj.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/44652847675.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/77769260598.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/3103439089.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075de7cc9be7---67372660892.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/i11u8mlg3vuoubnc07fs1fn4d0/donagukogoxiw.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb82575b43---mopojujugiseremoti.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/7849353236.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/ligupof.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/0c93eab8c0b956560fe6325680bf4c1c/4227357316.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=ff7+guide+pdf+downloadPDF 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_off0000f83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83D 10520 bytes
SHA-256: c4610da11ef934d9d3111e140dc5a3f6020ae44710c26a8c6cfec74257fb68ad
font_01_sfnt_off0001101e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101E 17636 bytes
SHA-256: a8c9fea41e4dcff89012286e6520883d6c66179a9eaa099b4aea26e1b946bb12
font_02_sfnt_off00013d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1