Malicious PDF — malware analysis report

Static analysis result for SHA-256 687d39db798e340c…

MALICIOUS

PDF

72.2 KB Created: 2021-10-01 03:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c9924d849f3c90123529ef8bc01cfad1 SHA-1: 1bb2c6e54e6b285dcb1012a1d9414399d1a1d651 SHA-256: 687d39db798e340c5ba54e55f15a0aaa027010c92e1379ec0ee83ddda0d0fc34
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm for phishing or malware distribution. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, a common tactic in tech-support scams and callback phishing. While no scripts were explicitly extracted, the presence of PDF-specific heuristics and numerous URLs points towards a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://terezmisszio.eu/files/file/94809926534.pdf In PDF document text
    • https://gfwofficial.com/ck_imgs/files/kiwatinumogesupupofene.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/sagiguladesomevi.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/firibapejafoxadi.pdfIn PDF document text
    • http://floramarble.com/uploads/torepubezazi.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/nr5bafea7aq9d1bp2643ipoe03/64825982120.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/tirivi.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/ganago.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/bikirefajiwuxor.pdfIn PDF document text
    • http://philipsphotographystudio.com/64720163187.pdfIn PDF document text
    • http://groupkaishan.com/d/files/jumakaxajoxedenegobabed.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/55806671245.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/48034752510.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/nimivajazifisemuvunuloj.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/4e3a9c9ad3c33b6da91ed85aa14fd97e/peguwowuzekag.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/22852753870.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/62380681429.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161367e5f26aa7---26251936893.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/83962153595.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/gegan.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414d9daf626---kagamusafizoxopapan.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/61300281264.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/01a0a6f387e03c62947af079bc095961/tasuvufumawali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=coelho+sabido+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_off0000b4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE7 10420 bytes
SHA-256: f245e77e18293a71d90a03a0f5e58fb6e9703256fb3065076c5e6a45b37e2be1
font_02_sfnt_off0000e467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE467 17404 bytes
SHA-256: 603a463798f49f057b18c7018a1499c02c52911597c42aa8449016c2573629e2

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