Malicious PDF — malware analysis report

Static analysis result for SHA-256 7282d87fd3a4b046…

MALICIOUS

PDF

71.9 KB Created: 2021-09-05 05:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19dddec2a6128875e1428e085ab93fe0 SHA-1: ab185af662581a54a8bf2e842884a7f4bbe627f6 SHA-256: 7282d87fd3a4b04666780b5c7d97219189e656b02faaa02181d5358edf510137
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload storage and disposable hosting, likely to host further malicious content. The document's content, though heavily obfuscated in the provided excerpt, is identified by a heuristic as a callback phishing lure, suggesting it prompts the user to call a number for a fraudulent purpose. No scripts were extracted, but the PDF structure and link farm behavior are indicative of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33c1c19c97---96288912774.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a98edb572b0---fovana.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e62ca30629b---65959521266.pdf
    • http://dzbnf.com/upload/file///zulubonuvakure.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160afd07684911---66186611816.pdf
    • http://wawa757.com/uploads/files/45749572330.pdf
    • http://www.anclupnapoli.it/userfiles/file/vidukarukazosirodefe.pdf
    • http://location-venise.com/italie_documents/files/20601269355.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e77161f4544f512f673701b06cfbb4d7/loseduduzewutakikivuganor.pdf
    • http://augsburger-dartliga.de/uploads/file/85105787677.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160945b6d54006---naforukimekipapowef.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/db47f16b18fe47adc0eb1489404ac2e9/rujatalojelekanepumuref.pdf
    • http://entryexpress.online/chapter_images/files/vowilawevogujopebuvokufa.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/4l0pqhg53m577idndudb5hajaq/11372346551.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/jlmqib442jose8ip2c6g4ge1n1/47165451759.pdf
    • http://otvorene-srdce.sk/userfiles/file/87700780094.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/f1f17fdbcd838622de9a639e51f979f2/66926652002.pdf
    • http://duszek-lasu.pl/userfiles/file/81692759015.pdf
    • https://sce.tw/uploads/files/60cd6e135038b.pdf
    • http://files.ibiza-ferien.de/file/nabuwa.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c7165135f---rosikodibifepajelunod.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/57ed0a93258fa6e57c046962b3657a3f/mojixunuraxeviwexilezedav.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078edb35bfa0---kevadon.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=sears+diehard+automatic+battery+charger+manual
    • 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_off0000b895.bin
b0bd226a43c2341deeef7528c5c39a7979cf5c5c97e29f3f36b68c9a2eeb50cc
pdf-font-stream PDF embedded font (sfnt) at offset 0xB895 15472 bytes
font_01_sfnt_off0000df5e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5E 16792 bytes
font_02_sfnt_off0000f775.bin
f2dc91e008ce6daea5d479edd3bbea8e02517c21cd91ca8760e884db9a2a9b80
pdf-font-stream PDF embedded font (sfnt) at offset 0xF775 11248 bytes