Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58a08e2de92acb9…

MALICIOUS

PDF

91.8 KB Created: 2021-07-17 08:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3d9a747ecf3611093454e13cc6d30824 SHA-1: 2a5b766ee8052eab445e190d60cf12cc90dc0705 SHA-256: a58a08e2de92acb94e298af6167a3cefc7087860abdd5eb2c92e124bdd2dac31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan distribution attempt. It functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised WordPress upload directories. The primary purpose appears to be directing users to potentially malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 6

  • 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.
  • 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://gruppocinofilomarsalese.com/userfiles/files/lexotunevo.pdf In PDF document text
    • http://xiaohecollege.com/d/files/bukewepiborejubewonole.pdfIn PDF document text
    • http://hosteleriayvending.com//ckfinder/userfiles/files/risew.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e882787a63e---dusapinojemawitisosasif.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/709fced7eb46e756c66d29800734f81b/62950762279.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce1e1dd6be---saxuwoposenoremevobofapok.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9876221bfd---xolimifudunugelal.pdfIn PDF document text
    • http://berbun.com/user_img/file/89968710897.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/vafuweba.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/madonutumuv.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c0498d174---59465616016.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/17cd91ae31ec34ff59d1cf9c80daba05/woxaxaf.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/8b732160bd7064503e80e878f32bec83/bedodima.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/e9370083af5b85f94b775678928d3c9b/2153853825.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/8180de471ef3018b276fd42f069918fb/37665235251.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/91503656019.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/81520154576.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609412a130bd2---mekenagebi.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/1823115556.pdfIn PDF document text
    • http://teraval.cz/res/file/sosapufaro.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/mafumexuwexesesulaz.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/modutifabiratijep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=justin+moore+that%27s+how+i+know+you+love+mePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF9 17232 bytes
SHA-256: 04a4af8bc4d4b330a73e3f68258288be695c34209e659ae06b6f7b020b0b5024
font_01_sfnt_off00011919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11919 16160 bytes
SHA-256: 27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46
font_02_sfnt_off00012e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E93 10856 bytes
SHA-256: c78d1be264c16e92ec4a0028923887eeaa59a303fadde10daa7262f6ce19778f
font_03_sfnt_off00014799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14799 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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