Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2f3b74478f37aaf…

MALICIOUS

PDF

81.8 KB Created: 2021-08-17 06:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6884bccb7da2c2b906e89e8d648f475 SHA-1: b1a7111492515ab6f336882110ef0cc3bf30211c SHA-256: b2f3b74478f37aaf543762ed08fae59ced42573b7cbb8080096afdb83a685817
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://german-ex.com/42421215612.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21f8f1f6f9---rikopira.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/1626332739dccf8d4b18e7d76152a2e8/livafozudixawox.pdf
    • https://ipic.vn/userfiles/file/setolorilam.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3d7831cec---nokivowizi.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/388d7d46edb81cb47261ca439135cacd/41046016273.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3ad9a74cf2---7384776269.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/ae12dc2f0b1b46b23fe3bf6674cdc1fb/70974820850.pdf
    • http://jshtextile.com/UserFiles/file///38464708654.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/aa0c0a8d68a7819cb4a0e3be05e3bbba/56333389762.pdf
    • https://www.geo-decouverte.com/ck/ckfinder/userfiles/files/tudanodatufidirupawuvesep.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/df610ba41cf6c832ea0df42a3db14109/9566482062.pdf
    • http://seteo-dechets.com/images/file/lologixesiligusafop.pdf
    • https://mimpishio1bet.net/contents//files/tinazewipilesivena.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a12d3505aa9---xadugewo.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/f612jkldaooc9j283ub3eva8rl/pumizofuxamobodixeko.pdf
    • http://tacchigroup.com/public/thread/risorse/file/56752386433.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/0ok87mg7l6ml9t7mjk6trt4dq4/16991017993.pdf
    • http://boldino-hotel.com/ckfinder/userfiles/files/dirinemejage.pdf
    • http://acmemask.com/upfiles/editor/files/46246798625.pdf
    • https://renebeumer.nl/userfiles/file/79643323790.pdf
    • https://www.myosiaffiliate.com/199trust/img/file/81392731807.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+take+picture+in+video+iphone
    • http://e1pl2.nazwa.pl/busy/fotki/file/94277653620.pdf
    • 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_off0000dd4a.bin
0d38cbafc65a4e00963828be747791dae5771b1032b89353c572be06b9e367b0
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4A 10732 bytes
font_01_sfnt_off0000f5e6.bin
83f20d255a817c53cecb925678e8360856a2c76ffae085fc4931dc7579bb55fd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E6 16364 bytes
font_02_sfnt_off0001200e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1200E 16792 bytes