Malicious PDF — malware analysis report

Static analysis result for SHA-256 94c9feb53f8a5c41…

MALICIOUS

PDF

96.8 KB Created: 2021-07-01 12:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 783ee0d14a34ebad93ee1e7fa8e90581 SHA-1: 24e3de2af4843fa9386d08a46c08753ce0c5bd31 SHA-256: 94c9feb53f8a5c4189b17d71d0b6f1543a69c5f9ad33dcb1522c71646e5ab599
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised CMS upload storage or acting as a link farm, suggesting a phishing or malware distribution lure. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, likely facilitates the redirection or payload delivery. The primary attack pattern observed is the use of a link farm to direct users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://atamergranit.com/userfiles/file/28206474263.pdf In PDF document text
    • https://ihotel2b.com/upfiles/editor/files/12481402187.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/9a862e0df0db62c5707aeb523d6660d5/70043162379.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/71574324442.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb1e67a79c---gatilotigomupupubosujaret.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b3e009f58---xaluxoluxemi.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/20421596341.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc8aaa525b---tajavusowib.pdfIn PDF document text
    • http://paulsaperstein.com/userfiles/files/dejuxi.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1hdnokrpri3m6mlqi7d4p5svd7/76392022499.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/poleliberetodunesipeg.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7209379db5273b45e19b74b7ddd637b3/denudovupegexa.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f2b87c350b9b0ce15603edca587fe9b8/lifutiduxe.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/71945265911.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/ibtvo8nv93n6ivrm65qetf07b8/62798588462.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/82asttrojfi9k1h8eau9ep8or6/25598272666.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/cbaa5350759ad2497b12ea572a807c31/13937944852.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/e4b0f01a6ea4bf8feadfca49f39a97e4/88467548603.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58616107172.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609853b45997f.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/zawoje.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/goponogupaguma.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0e39bf050---vososog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=physiology+meaning+in+gujaratiPDF 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_off0001105d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001286f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286F 20064 bytes
SHA-256: 86500fcdc4321645cffb3106dcbee37f01096b26f92ddba3c528ff0920dc00ee
font_02_sfnt_off00015d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D27 10900 bytes
SHA-256: bf8c66bef6d40589614af9948c8e826839f75acbc7474944422e2861492cea50