Malicious PDF — malware analysis report

Static analysis result for SHA-256 f057cf5efc4ed068…

MALICIOUS

PDF

80.2 KB Created: 2021-09-11 14:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b972e953b96344f9c0f079271747a81d SHA-1: 96ab3a558e7f1effd81b6dd9e114bcd363e3c5de SHA-256: f057cf5efc4ed068b8ec966e29fe75cfac6678fd015c8093eeeaf4cbbd4b5132
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised or disposable domains, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://archism.ru/uplcv?utm_term=what+do+you+need+to+make+a+furnace+in+minecraft PDF link annotation
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/84508389623.pdfIn PDF document text
    • http://vaynhe.com/upload/files/54103009442.pdfIn PDF document text
    • https://fasaac.org/temp/files/wudafijubixewa.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/41221283849.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139a531ac0d5---66901669690.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/sezomewexenogojasuzod.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/29247159784.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/tagoxota.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133a57c6409c---taxefopotino.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/dovejufejevowosokobuf.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/jukivibezasutali.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/nifesebabifa.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ec6b4cde0---surebuwiruxevuki.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/fetutanejuwalelelonodema.pdfIn PDF document text
    • https://ivantomanov.com/userfiles/file/baxujipojomukikejiwumaf.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/tunababavuwesarefegodaso.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/10521501583.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/17946191737.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/0268a85d554fde0fb77dede331bf0145/26890219316.pdfIn PDF document text
    • https://telorgabus.com/contents/files/33091249890.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/bamuxuzatelu.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/74106271164.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/dovor.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134aa3e8780e---73857618761.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/wamutaladed.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/vawamofopez.pdfIn PDF document text
    • 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_off0000d555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD555 10828 bytes
SHA-256: 6205a5da93c4d73e45455dd43c07f8bec06a10103b17b1f6424b050a72a852f0
font_01_sfnt_off0000ee24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10636 17192 bytes
SHA-256: 83345bc23b1658659c871eb3ca0d5c82faded0ff11798a944213531a40760142

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