Malicious PDF — malware analysis report

Static analysis result for SHA-256 c412b69b690e3888…

MALICIOUS

PDF

93.2 KB Created: 2021-06-28 14:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 120336632bb186e8932c1fffc5b3a21c SHA-1: 7eada2634981098e9a2170939b0fcbf7f56ba3d6 SHA-256: c412b69b690e388894b16a76f5d695adf08634f4387235d143e30a2a95bcd18d
164 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kaowei.tw/image/files/20210617_020135.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d716b167fd4---purefaxeduge.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/u1aai45edbrs00420are57d8ec/62997451978.pdf
    • https://organicfertilizerproduction.com/d/files/65616549337.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/qi3ak2n6c4v6dfk151p3qald5e/47455198245.pdf
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/a9963d06c943b5948f1015d5816ef6ff/fupiwuj.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/611c8eb461c886417db615cb8f93fed0/lulotajivatitogudenefilod.pdf
    • http://dailitara.lt/bites/uploads/file/36360022611.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/qioemf8mkhe8ffo7pqltl5oep2/xiroledugudorixos.pdf
    • http://bjhtdszdh.com/v15/Upload/file/2021626727539496.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/0e03b2601102dd585026f0940e0d8f2e/53404978366.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c17de527d9---19796433763.pdf
    • https://bandai-k.com/userfiles/file/69597938874.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/541oukgd5kelrpf1pe60ta38ik/dizufovizumuxaworixox.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/8hlk3chgk3dl6ia0qcke1np8tb/1843484875.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/k7p2tedup64p619vpbhgnjj3q4/49863244407.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609d99e47c7ea---15407690094.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d083edaadd---xuvifibuwalapu.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/80e5f0fb75f8a52508be4c9310111fd2/jutudex.pdf
    • http://nappsa.org/userfiles/file/56834230505.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/ff7bf296ca28a640607fb1041288ae0b/rawebewegazimorivetu.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e1be407972---wosav.pdf
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/denalipugilegepebopilu.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/8d0fef78c3b801bb07f032897191f75d/dofemelizawalu.pdf
    • http://bike-aholic.com/UserFiles/file/44531457191.pdf
    • https://wendi101.com/userfiles/file/bidij.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=chapter+10+biology+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a13.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A13 16792 bytes
font_01_sfnt_off0001222a.bin
831cde4c9b623b2eec3b0d4cbd1b431bcd79299693bb18f008de51d67ae8b579
pdf-font-stream PDF embedded font (sfnt) at offset 0x1222A 11076 bytes
font_02_sfnt_off00013bcb.bin
89d2f639240e5b82283915c1673eaf1bf13c1e32476d06f5d29894182c1526da
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BCB 16736 bytes