Malicious PDF — malware analysis report

Static analysis result for SHA-256 919625ecc7dcb7c8…

MALICIOUS

PDF

110.4 KB Created: 2021-07-20 17:35:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7944b2211b3bc742691abfd20537040d SHA-1: d9043ef96b9a1f83984c066a7e4a6df48df1575d SHA-256: 919625ecc7dcb7c8bb45b3700def7650623e80d7786595ce32c3de45843069cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The presence of multiple external URIs and link farm heuristics supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://dvarenda.ru/upload/file/56161386178.pdf In PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/89409456541.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/foruwefujotirix.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/e4duovp543li35ajk5hpse2a09/gitotadugokimepapogo.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/dovoguvojigim.pdfIn PDF document text
    • https://airshow-bg.com/file/77048118356.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/lt4205uts40q44ufnuf3nbof01/37506633266.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/4dof786ntstgtvb35fngsmic90/2559804421.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608e9944ce70f---madefozotikajimepu.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/37739489627.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/3g4vih35o6lopmlhcdjvjv179d/sizefowunaro.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083db61da848---kegulakaladereli.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795e40b1c62---jonetaber.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c4e9bec7a---54355301800.pdfIn PDF document text
    • https://dienlanhbachkhoa.info/upload/files/14921002999.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075797498e60---46574692851.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad25895bfb---zalisiziwigetajitevofezaj.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/c51ilks30h39bn2g1v0g53nirg/87629175894.pdfIn PDF document text
    • http://enidbtwcreunion.com/clients/5/52/52e94d62e82ff66504c7d921fc07bf70/File/dinixevotilunusizew.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/jtrimq1a3or2vh3rd4m43mnif7/13997962313.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/72988167995.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/12968266613.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/h6dtq5ruuruo6bas4k46a9sbm5/26817726564.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/8abf9f8d590bbd98d7c128b4a475814c/16341529239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=were+in+past+perfectPDF 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_off000144d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CE4 21616 bytes
SHA-256: bb2d728696405293f9590eabd00723c9e463bec0c9078f2f3efba95548126c8c
font_02_sfnt_off00019520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19520 10300 bytes
SHA-256: ec250cbf3376a8bb71351ed1f487f983882fa6661c0256f282c119f4851bb418

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