Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c828910dc9e6867…

MALICIOUS

PDF

99.7 KB Created: 2021-07-05 10:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71f4f25c98b44bcd5495316c7339fa85 SHA-1: 5e420462107e4273c03885d099d27807a934a7aa SHA-256: 2c828910dc9e6867effa58295ee6fb21119ac3426c6e2d66a26fd96bac563d30
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised WordPress upload directories or disposable hosting. The embedded URLs and link farm structure suggest the primary goal is to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9872

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://614move.com/clients/4890/File/95859601786.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d31b6f87b27---50032465150.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/84a033b44fa84975aa7ba36372157746/dewofebebimupurogikevugi.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e4abb77fe---70304458561.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/mqj0295rgg3o8f98ocjdoge4qb/fubetob.pdf
    • https://audreyheselmans.com/_files/file/potebip.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/73347fd95c301ffa87d59e1e50a36ed1/buwixisorefejasenugo.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/80ef4a358m4tfjnss4l0d4httl/fuwegavarenibeleka.pdf
    • http://acecaalcoy.com/userfiles/file/24499503470.pdf
    • https://dptech.vn/uploads/files/poluwenetedakawasiro.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/m7pn2f4mqn21rcgelroe298d96/59574744708.pdf
    • http://muslimofwestbengal.com/mwb/editor_upload/files/88953456499.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/4e905c374d035560e67eb87607c6aede/75615302780.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11f5914a63---lotanawuvufise.pdf
    • http://studiotecnicoprato.eu/userfiles/files/90622700521.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda1f3905f3---15220548055.pdf
    • http://proxima-design.cz/files/file/33735617918.pdf
    • http://travelport.pl/userfiles//file/61111283223.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/81670058f306d29047e8ea12313c03a4/jonerajozov.pdf
    • http://seamcc.com/UserFiles/files/40746421172.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/837bc0a22fc96d2c1764d86c43cfa8aa/89316643920.pdf
    • https://nestaerospace.com/uploads/file/6164229079.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf828c3ecd---1402904227.pdf
    • http://topspeed4wd.com/ckfinder/userfiles/files/85051911859.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=a+midsummer+night%27s+dream+act+4+scene+1+questions+and+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d5c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5C 16792 bytes
font_01_sfnt_off0001256e.bin
0107e2cf9c10c93e76f43a56263aa6ec750c5b725dd4ef06722bf89b4a68acde
pdf-font-stream PDF embedded font (sfnt) at offset 0x1256E 17056 bytes
font_02_sfnt_off00015138.bin
5eaf2bf7ff9db760f294d79822ae8bb6447c4da7e74d01a45d8c6a0a12ec7fab
pdf-font-stream PDF embedded font (sfnt) at offset 0x15138 11248 bytes
font_03_sfnt_off00016b17.bin
37c4223d7c774cc946d04c327559eb726ea8f7eea2948b74050dfd2031625e7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x16B17 16104 bytes