Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d66a0127ede3886…

MALICIOUS

PDF

89.2 KB Created: 2021-06-29 02:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae4bd41b5a495b29e22ae8817e4855d9 SHA-1: 4d633cc303857acea7b935015e1df26c034464a4 SHA-256: 3d66a0127ede3886aa4f6e0afa21edee6bb1d2d157f49a8bd61848e9879061be
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV also detecting it as Pdf.Phishing.Trojan. The document contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://bagliodeimille.it/userfiles/files/limizepotiwejobil.pdf
    • http://arci-mp.fr/admin/File/16271825627.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f905da10d5---kuxoruwodanobibov.pdf
    • http://amon-syotengai.com/userfiles/file/matolafilad.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8016d3b78---bowonuvigolijifevuzejobig.pdf
    • http://fluitec.fr/ressource/site-image/files/xilovenafibebudunizaz.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/4817c31f6003724fa919d608624c0b96/5446463469.pdf
    • http://turhantur.com/turhantur/files/vibefen.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796396c9faa---tapunifopinotitowugajoje.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607a24d22f228---76108785115.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609e20ce713bd---33971909571.pdf
    • http://cw-cut.com/uploads/file/tifajerar.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe01034eee---62650241855.pdf
    • https://rozgarnetwork.com/ckfinder/userfiles/files/mosijadawokonar.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/e7b4a801ed8205ea64cf63672144220b/71269294982.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081e191b965f---juvek.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/d1089347872b7d32646b5515e35ee08c/4423828253.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/o91jfr8rsjc3reggg5jrseunkv/jalisekenibafabukegim.pdf
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735a470a444---jozufanelomejebefebapon.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/85024b8973a22de6f5bbd76d89f2b7d6/sevufowalatagopolikil.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160715d2ee093d---84984620195.pdf
    • https://rybczewice.pl/userfiles/file/93123596768.pdf
    • http://ecole.ru/text/images/file/dupajowuk.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1cebdc4162---31700153431.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67d545f39f---43913411518.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=english+proficiency+test+questions+and+answers+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_off0000f69d.bin
0f83293500481322e83bde8def36e0e68bbdba2e020717d4931cd3c6f5ba3460
pdf-font-stream PDF embedded font (sfnt) at offset 0xF69D 11328 bytes
font_01_sfnt_off000110b9.bin
0bc872d9f28f720873a5626db3047455397c4336ff66001006a9325a8c20432e
pdf-font-stream PDF embedded font (sfnt) at offset 0x110B9 17568 bytes
font_02_sfnt_off00013ed4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED4 16792 bytes