Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f026d7d2525273e…

MALICIOUS

PDF

83.2 KB Created: 2021-06-25 18:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5f8012cea799df43a778221c692a134 SHA-1: 15ae672656d60e8d7dc3ef72d45caac0e3abd91c SHA-256: 9f026d7d2525273e081349557e592aacf08b5c34a8817432394f3f370fee943b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics point to the PDF acting as a link farm, directing users to compromised CMS upload directories and disposable hosting sites. The presence of embedded URLs and the nature of the heuristics suggest the PDF is intended to redirect users to malicious sites, potentially for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://alituncer.com/userfiles/file/joxosizegemom.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/27053776687.pdf
    • https://betenrealestate.com/sites/default/files/file/68159315025.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b42127f1d---4220042072.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e6421671a---56992281686.pdf
    • https://abe-rdc.com/userfiles/file/vafurisizalezanarupusobi.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/a7pdtmtr4km2v9cjf5vku1oapl/dilofubukotagisezobidil.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/34529ee53a468b9fbace90723897cd07/35835082042.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/25697dvocs5g5fboev94kmcfm4/mijonepibozagelodopapu.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/a64a4ee80360da75d31f1e5fdd310ad9/92596895312.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/1almg2df3q1pgsnsap1k6gqho1/tenalofijolub.pdf
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/oh15lec7q8k32aqn0el2ktoe91/35653615928.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16094ee4ee17cf---pelonirukuboboxili.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/6a0d6811768a3bf74d1cf09a72a9df9e/mufur.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d981d85fb---gapavabu.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc873d03f1---56537136524.pdf
    • https://binarbaidequipment.com/public_html/userfiles/file/52263251100.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/1902b45580741288dad5216d9f0a5206/17570359835.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/0c553d6a37c24b5dbb19375721b650f2/nepomanijolunelorep.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/9ju3v7vg54bg6q63vtou0thpm3/bevofoxenikafopunolod.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=the+arithmetic+mean+of+first+n+natural+number+is
    • 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_off0000e2d4.bin
97c3fdc0709eeae040e4b979c34fc0a1344b80a5f9c745ae15f8a7000ef2916b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D4 10804 bytes
font_01_sfnt_off0000fb8e.bin
65b53dae6ff879ee825886f43f42c31e73284f93c29de3a7184ab50f234267ce
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8E 16860 bytes
font_02_sfnt_off00012755.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12755 16792 bytes