Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2650b68826f409b…

MALICIOUS

PDF

83.9 KB Created: 2021-09-09 02:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f80c164d4798922cf771d597acd84095 SHA-1: 33fc715c30ec5c7517721ddb83015e046291f833 SHA-256: e2650b68826f409b9c2eb63871e76d7b0b303f1c6d29a47bd5dde44ee2d2aada
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of multiple PDF link farm heuristics suggests an attempt to direct users to compromised websites. Although no scripts were explicitly extracted, the PDF structure and associated URLs point towards a phishing or malware distribution scheme, likely involving a callback lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://investincarpathians.eu/app/webroot/media/files/ladasutugi.pdf In PDF document text
    • http://engroupe.ca/aym_image/files/24712444209.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613174663be30---ruzoj.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/35265919861.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/gabulezozokipebiper.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/99331213293.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/73890175890.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/85222067216.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/76606425502.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/4ce00ff4820f655da4a714031a497479/molevomonanagar.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee39eb0477---73288791319.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/97fa71238d0face81f0433c8be712eb5/farurugabazebudinoxajol.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/95010882419.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/62131210907.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/cc9792d4d8761c61a91d97fda0c30934/wefujobesom.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/73906088701.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/55882739128.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/benetojomavexiwodirefusom.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/ruzodujuvewabarujenaxa.pdfIn PDF document text
    • http://mobitransjogja.com/files/9626136641.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/74368203614.pdfIn PDF document text
    • https://soechi.net/userfiles/file/53516011153.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/97145912525.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/wekunixamamirogel.pdfIn PDF document text
    • http://hejia-ele.net/upload/67304894349.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=c%C3%B3digo+de+ativa%C3%A7%C3%A3o+sygic+androidPDF 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_off0000dedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDB 11312 bytes
SHA-256: 25cd517ea2ea6a38877e4e03ec6b8f33f467ad2283ff33c22da6a30dcc6fd17a
font_01_sfnt_off0000f874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF874 19340 bytes
SHA-256: 511cbbe51ad1f351b7c942bd5427bb71cbf8c028460dca3495b74b117710130b
font_02_sfnt_off000127e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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