Malicious PDF — malware analysis report

Static analysis result for SHA-256 4037a19463a8c039…

MALICIOUS

PDF

82.0 KB Created: 2021-09-02 10:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1a88bfbacbabde5d8b173523b59ca530 SHA-1: e9ac36679f89804d74510bc9c985219caf476725 SHA-256: 4037a19463a8c039e659349420af01c48d6cc4d521e29ed25984e41a60207344
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns suggest an attempt to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://solturism.ro/images/file/78921112734.pdf
    • http://naturalmis.com/userfiles/file/bazegivuwuvodezanana.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ec4fbc25c---gixogonurefabuvidomunagi.pdf
    • http://clinicaveterinariailmarzocco.it/userfiles/files/61205267499.pdf
    • http://www.corazondelsol.es/ckfinder/userfiles/files/47272689582.pdf
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/dotavemaponilinululido.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161107a14d43d9---nupemeder.pdf
    • https://mimpisiluman.com/contents//files/99361640238.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfc3e793a6---sifubologuwixowo.pdf
    • http://ulv-fogger.es/d/files/ratuvomimimuvezagazeg.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/706407f2417227d21a1c517eb0b60011/60562754283.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/1f787399c4400fa34c6761805cd1bd88/zobepepagito.pdf
    • https://tinhhoaxanh.vn/userfiles/file/43196643274.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109f4b52d901---72718136449.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4be05614a---45820442713.pdf
    • https://burgaseguros.com/userfiles/file/10571222346.pdf
    • https://fajndoktor.cz/images/file/files/mabelelixaweperuka.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/l1722tk4j6lbqcu6qra4ndul45/20128249435.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32c8444b46---7000532056.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b223ebbcf6---fejasexa.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16070ee6e6626a---79942762663.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa371e8b073---xuxul.pdf
    • https://damsindia.org/admin/uploads/file/juzonokekagajokuvew.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=plc+electrical+engineering
    • 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_off0000ddcb.bin
a10ebcb629cb99b0e871352254128aa503fd20590000c95d64589e4dadf0fc1e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCB 17412 bytes
font_01_sfnt_off00010aab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAB 16792 bytes
font_02_sfnt_off000122c2.bin
39c2f85d53878a9149a636ab71f48cfec95cd11df1f399f44cb15e279c6cfaed
pdf-font-stream PDF embedded font (sfnt) at offset 0x122C2 10120 bytes