Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe983cca2f8aae99…

MALICIOUS

PDF

73.3 KB Created: 2021-09-04 18:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aabba80e1367caf0cc605f3d68c8bc4c SHA-1: 63559a7de228be4a165d3504e9963fd1e8c7b03e SHA-256: fe983cca2f8aae99481a39e7dec455c2dd57a84ac95cfddc4ed7e91ed0e7e02c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDF files hosted on various domains, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these linked documents. No scripts were extracted, but the structure and URL patterns are indicative of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ohana1bbq.com/uploads/files/mulubasefifiximutode.pdf In PDF document text
    • http://abnicum.com/files/file/soraxadoxabufadavarore.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/bikugefikesoduso.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160be93fbae0fa---jufobonemoradifokikugo.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/tetuguluxazupalisopepetus.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/9514370051.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/94332798203.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/wiwuxi.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210705_175429_9789.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/45151035163.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/43691669908.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126b16246342---71023111011.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a32c063f00---juzubadaj.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/kibegateku.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/24447193774.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/tunik.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder//userfiles/files/67081331114.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad31b74e3ff---71319795264.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/ak3ic41hmpqcmn809upo79k4r4/xiwobokix.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/zadugu.pdfIn PDF document text
    • http://jordanfamilyreunions.com/clients/5/51/51534e3e38036466a76ca8a024fd4923/File/xogaxom.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/set3a36kdusrdert7f55f4qsni/lafexopasote.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/nepivut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=inorganic+chemistry+book+for+bsc+2nd+year+pdfPDF 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_off0000b9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD202 16632 bytes
SHA-256: 2fdc5c409e96eb9a1ebc6db9ac2041de3267e42def8b96c836274e85becdeb19
font_02_sfnt_off0000fcd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD9 11440 bytes
SHA-256: e696d3e2207d81ad7695c123f7b59da6089371c474a6392995a4f77c98cb0cf4

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