Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a86e672af3b9c64…

MALICIOUS

PDF

84.4 KB Created: 2021-09-17 19:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 093109cbd32a3b61d855d1a0cf3a4d07 SHA-1: a73764bf752558d784cefd51dfbf533900feba8b SHA-256: 6a86e672af3b9c6406086de6c5d18053c4d0a8c2c07e85293c4eb21b532979c2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a number for a fraudulent purpose. While no scripts were directly extracted, the presence of numerous embedded URLs, some pointing to compromised CMS uploads, suggests a multi-stage attack designed to deceive users into fraudulent interactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.fashiongale.ro/userfiles/files/wajasurixakuromitamovo.pdf In PDF document text
    • https://cornerstonelaw.eu/userfiles/file/53332630401.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/45553802088.pdfIn PDF document text
    • http://aweibel.com/Photo/file/63474832188.pdfIn PDF document text
    • https://dm288.rs/slicice/file/32984844025.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/kojuzinogekolagumufugeko.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/rabibuzati.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/89445717418.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/lisojimirobabilak.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/10831077092.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/72008561051.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/10877531509.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210904093040675.pdfIn PDF document text
    • https://linker.tw/files/62479464028.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161406772abf61---48445176633.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202109162155401976.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f762659c6e---25326468560.pdfIn PDF document text
    • http://sro52.ru/uploads/files/41331106516.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/38e2b1abf7b852535f1fef7e41f0bb03/64134238646.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/vopirulaxafoleke.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f647392252---50343884437.pdfIn PDF document text
    • http://elitk.ru/_files/84185475060.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/57637472190.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/manevapelapaxazog.pdfIn PDF document text
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1631082325/files/pasenofosiwepo.pdfIn PDF document text
    • http://licausi.it/userfiles/files/lajovijabawunut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=nord+premium+apkPDF 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_off0000e694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE694 10304 bytes
SHA-256: d21abdc0d5d59fe7f9df2a35ae51d99c8b76cc09787a7cc69528487f1f9d5410
font_01_sfnt_off0000fdc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC2 17708 bytes
SHA-256: 5d3f1c8c14409833bda7bdfcc3dfa8fc9e2a7c53adc12687143ad7071a91e630
font_02_sfnt_off00012bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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