Malicious PDF — malware analysis report

Static analysis result for SHA-256 d13fc9ec40d42aa5…

MALICIOUS

PDF

80.6 KB Created: 2021-09-10 05:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8660fa7e7c76c1038cea883200a45b9f SHA-1: 26832773f745a3494ffef3009eae746ddc670c1c SHA-256: d13fc9ec40d42aa53d30a6086e7362f3a315c3b7f504f0b2ea29052b04e13a68
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised WordPress sites, suggesting an attempt to redirect the user to malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, a common tactic in phishing and tech-support scams. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://technestudio.eu/userfiles/files/nerikitaxeja.pdf In PDF document text
    • https://wittnebel.dk/file/finafut.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130a8975a53e---62983144773.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/xuxafosinazulakanobapote.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/17173752931.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/9653807197.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///wevewew.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/44257816006.pdfIn PDF document text
    • http://eternaseguros.net/files/files/15466492208.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/mogakebelogepuwekozikomas.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/hudhta0ncb9ai3tt4ha17a6l8a/41973695122.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/98772242678.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/tmqmqlr117j8vcud5ncu5i2pfq/24521073032.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/gosejuperuwobugulokejemip.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/12964240842.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/tadoxejonififetefufasupe.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/jijagazizamipeta.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f04b2bb52---munakunaxizo.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/bixazutumegufilepubimito.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/zuwezogunefajadozona.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/vobikesekilomob.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/75305432846.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/4594898543.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210909175145.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=online+password+remover+from+pdfPDF link annotation
    • 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_off0000d6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF08 17760 bytes
SHA-256: 08ee9d9fd345af4eebc1a0b884ef4408335d45c6d0b670e09b3c5e7d1d7d6976
font_02_sfnt_off00011c71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C71 10736 bytes
SHA-256: a58bc2a5e3bc9cd41f704d133f018cc197aa51fc4655a3a1be478968f8918767

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