Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4dcb17edc966c14…

MALICIOUS

PDF

68.0 KB Created: 2021-09-09 02:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b521da94181af99fa3d84c70844730c0 SHA-1: 086c8316f7fe4a7eec654c0e762ae66844b57217 SHA-256: a4dcb17edc966c14ba5bbbfe1286c33ad66adf91ec2455e0f5bc1459a37a2e08
176 Risk Score

Malware Insights

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

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links, a common tactic to deceive users. The heuristics indicate a link farm hosted on compromised CMS uploads and disposable domains, suggesting an attempt to distribute malicious content or phish credentials. No scripts were extracted, but the PDF structure itself facilitates the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://smidgel.ru/uplcv?utm_term=is+android+better+than+apple+iphone PDF link annotation
    • https://relaxbotanika.cz/ckfinder/userfiles/files/31708984648.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/dilezad.pdfIn PDF document text
    • https://iohrp.org/f_files/files/31342142512.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090722121945.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/kobaxalazunodel.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/96505157253.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/xonifam.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/18741143818.pdfIn PDF document text
    • http://m2m2design.com/userfiles/nodovinurazumaxoba.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/9966610467.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/97566994178.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/bidopu.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/36877286504.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eecefdcfef---51355254972.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16137346f5a1b6---61002343868.pdfIn PDF document text
    • http://demkapi.com/resimler/files/59543220157.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/63092612896.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/tasalitevotasifef.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/67900997973.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/juvaxetiwupasibezos.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/wobifobonarokus.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/31303178255.pdfIn PDF document text
    • https://windscrm.net/files/file/21824016918.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/f893ea3c45ebe2fd6e4000bee1b77916/39295531618.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_off0000aeca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAECA 10580 bytes
SHA-256: be1d83d9511d19bb81556b0b85d2c02aaf4ce0b84162293daef7c8f18f697740
font_01_sfnt_off0000c693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC693 14340 bytes
SHA-256: 4efd117f68a84188b309d7787935c90524395e364539eb9ebdf315c76b19df55
font_02_sfnt_off0000ea4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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