Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ab6eff55c47e638…

MALICIOUS

PDF

89.8 KB Created: 2021-07-21 15:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a35c2b1547a0d295dc861512137f65b3 SHA-1: aa4184df794f226fecec220ec439206ec2ef6fd9 SHA-256: 9ab6eff55c47e6385bbbab1e2708f3ad3a7b6297ced767bda2c07ea41d4de832
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of embedded URLs and the nature of the heuristics suggest an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://www.jindatunnel.com/up_files/file/vunegopilojapu.pdf In PDF document text
    • http://spalovnachemolak.sk/userfiles/file/60993834027.pdfIn PDF document text
    • https://caffedisanto.it/file/77011171270.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/0864cb1424e9c8ea533ecaaf9db9bbf9/wuvezupifitelo.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/26269519028.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/xenobukivixilusadakoxu.pdfIn PDF document text
    • http://aquatrustfina.com/userfiles/file/soxusowowisixutodubala.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1e52fe7eb45a749c91bac1c4e0eee668/pevegorufufon.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/35598540132.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/257185420.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f57e7575ccd---misuz.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/botitakekuzuter.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/gavepo.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f350774f8f0---vixirakezezitomewot.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160737181d10c3---dirotunibibifebukejoruz.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/kebamika.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/hd75kp9lrh5434d6crcj6b2p73/pulub.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/a30b4f7f5ee3c668c79cc4e11f003383/6730255056.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/a5cce9a6fb3e818a0e25d9ff5b603c55/230123568.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/19562492520.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/f43a48b6b38241974ba66b94cd8f6bdc/winupavile.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/98b17b56f877762f746ebf43dab565bc/10849373614.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/36851861759.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=i+think+i+have+herpesPDF 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_off0000fea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA8 16648 bytes
SHA-256: 2bac690fa487f624d8c87c55272e3bc354fa22708d0e9df661edf6d53576f749
font_01_sfnt_off000129d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E9 10292 bytes
SHA-256: 744fc6f671fe1a585330789a45bfa138401586ea2e1f92024832969c3355a8c5

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