Malicious PDF — malware analysis report

Static analysis result for SHA-256 4611d364285cc382…

MALICIOUS

PDF

80.1 KB Created: 2021-09-04 10:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 65237c229c0752cd8f3d8eb882755a58 SHA-1: f20ce66ea7243e4ebda2677481dd49191348a09b SHA-256: 4611d364285cc38228aeb69a57606b6c0eb5c18316d3a7de0bd6b320dd7f3f47
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 other PDFs hosted on compromised websites or disposable domains, indicating a link farm designed to redirect users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports maliciousness. The primary function appears to be distributing further malicious content through a chain of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://bumsnab.ru/uploads/files/31712775037.pdf In PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f996a8004---tolegexagivojujedowonaxe.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/c02cf84a07d4e0f8b16f2a425e3606e3/78551571303.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/govofixalajixamazuzosuz.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/vaxobefobogir.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/82097234001.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/babalidudapevo.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874fb47ad8d---63432855189.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccdb97ec4bd---binewilabufejafijofoxe.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160a15fc0ed67c---xeviberuwumowivikuxikoxe.pdfIn PDF document text
    • http://alltechsro.cz/files/ralexatir.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/61978603721.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611260d789730---texujuguzad.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/23327341244.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/01a6dec5a71d305ea8fd0a9088188303/51032453331.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160dd9c65125bb---34777607238.pdfIn PDF document text
    • https://atrax.hr/files/rizuwajanubodovu.pdfIn PDF document text
    • https://alutat.com/data/file/wilopazomunikobukeza.pdfIn PDF document text
    • http://letdentalab.com/img/files/79265354123.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/7a46eff6aeb8a3a070e7d20d591584de/rubefuvewuvuse.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/wipazexoditujuveluwir.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/zuraleridejidusix.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///wogokikisi.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/40340907943.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1b30623ec---waxax.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/gereseribukuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=litany+of+all+saints+malayalam+pdfPDF 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_off0000c642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC642 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE59 10496 bytes
SHA-256: 684eba6b4e0e6460f2eb560e6697802b045e795fc39d1b7ad346727930cc27ed
font_02_sfnt_off0000f632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF632 23300 bytes
SHA-256: ea0e425cc8518ada0a4454943bc7725692104258335554cbcf3a41029702aad2

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