Malicious PDF — malware analysis report

Static analysis result for SHA-256 1553a0c63d75bbf3…

MALICIOUS

PDF

90.5 KB Created: 2021-07-07 17:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 299418ae2258488c62f7608f3a3a9a19 SHA-1: f306a8158285f10a3bf5dc7fb0199f044c83fe9f SHA-256: 1553a0c63d75bbf32272cb016c91cab1a11345eb616946259c0683e16780f1e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to distribute malicious content or phish users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to leverage disposable hosting for malicious links. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=sweet+potato+fries+with+ketchup PDF link annotation
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609db9a904605---18251598318.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/58267985447.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf33d60035---telaxufarawobetabigeru.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/xupukuzijes.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/84484461657.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74b9c610dd---jogejakudexojozukoworabu.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210605021759.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1259cfa98---90485778886.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/80e39c7bc3242403786721fb41599a15/98851444207.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/a47054e9d77786b5d25ceebafd2aac92/gowakupufa.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56a21a9950---74657419032.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/robane.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/5c6cjt4gk6v6qm9dcbbgl72t0b/jerizovafuk.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/f73cb755c44e474cd81599af8e00c767/74715029271.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/55709948291.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/neraravoxetazunazezava.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/9ssm0gushr926hhqnrol07nvt9/33807613350.pdfIn PDF document text
    • http://storemisr.com/uploads/files/fexotojaxopimiwuf.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/96633919401.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/5559789308.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/25168952740.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df825060f9---vuwawa.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/38847073152.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE653 17636 bytes
SHA-256: f92eae78ff6a7df94dc2bcd06955b4011d5566135b81fd46f0445a7154cb3c84
font_01_sfnt_off0001145e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145E 10780 bytes
SHA-256: 6b3d71d7b0283d7dbfed3229acc3aa62dc42b56afa0fd10628b6fe9f5005becf
font_02_sfnt_off00012d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001457f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1457F 16084 bytes
SHA-256: d11bfa2b02c462a3f9075532ce7ec1132ca3691ccd6a850e0dcf0119a218c04c

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