Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c8b825f14068cd7…

MALICIOUS

PDF

87.0 KB Created: 2021-06-27 06:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ad199aea93fd8433daf17423e9c5a30f SHA-1: 81b919b4150542a309b988f4ee946399f1071f4f SHA-256: 3c8b825f14068cd7a937746d814494d01bc3e0ce0c897d2728e37cdceb42e03e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm or phishing lure. The heuristic 'SE_CALLBACK_LURE' further supports a phishing or scam pretext, likely directing users to malicious websites or to initiate a callback for fraudulent purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • 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 https://oniceh.ru/uplcv?utm_term=state+of+connecticut+judicial+branch+case+lookup PDF link annotation
    • https://abofahed.com/userfiles/file/36818975914.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/pekuxuvijorugagekuvi.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f360ba194---29759529330.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d18411830---23331416698.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/fifiwufonodipamalideloba.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/b15592d14d6b87ffd98be506b7b5a034/46268125074.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f3bb9bed9---vededa.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/tegugamep.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160717efc068f1---sibirevupalave.pdfIn PDF document text
    • https://jambumanis.com/contents//files/26957645799.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/3838887280.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608b798d278e3---53380885959.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/50362715663.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/llegqluq5nbp0jj06g5tiffte1/94893760395.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608155db2f95b---zimadizoludalobafadudop.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/14750596704.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/93099110015.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa13c75d6a---kadopexavipufegulopu.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/3bkelb8fuo2l6h27hgle86kf0t/jodaseverotunif.pdfIn PDF document text
    • http://renovator.cz/files/file/ludano.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acbb5c9cb5---xilirozetadenopapus.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16087197a5c40e---68029301069.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001068f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068F 11252 bytes
SHA-256: 47b14e9156bd99309a2b7581a7d98ab4c18620b40e544df09136ae272629f880
font_02_sfnt_off0001209a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209A 17488 bytes
SHA-256: 9e2c80ec33000ebdda9a8d7425bcd6f1abb5e42a2b08e9b5e47bcaf40c79b482

Open this report in the interactive analyzer, or submit your own file for analysis.