Malicious PDF — malware analysis report

Static analysis result for SHA-256 74a57f0e326d94b1…

MALICIOUS

PDF

81.2 KB Created: 2021-06-27 21:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75c0bb11568edf5545fa3d7eb62cd125 SHA-1: a80b9bb6905bd6d1b338303f0397d3414e2e67d8 SHA-256: 74a57f0e326d94b1dfa17ce270fd0b345e5a7e7e357baa623b5bd68807df8968
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable domains. The embedded URLs suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://egf.tw/test2/images/file/98201727022.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072af97ed5f0---4346626467.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/1fsdffgs9jflmm1f1h1956pn0l/81590377298.pdf
    • https://beautyyaurient.com/editor_upload/file/4454971294.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085076526806---9190248581.pdf
    • http://smartvoicecom.com/userfiles/rewatebifefegip.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acb58bb897a---64339303961.pdf
    • http://ahxxzx.com/userfiles/202104/file/dazodejajeretawedi.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608112ddf4074---wokepimugiwadi.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/27df93cc9566be13f883b5c7d4fd7dde/87263537732.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d59c446af---fakaved.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/cfrtl61f179gdrllj4h0vftg5i/66476216419.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6137f0749---nizado.pdf
    • https://aslimitada.com/userfiles/file/moxeser.pdf
    • http://kibbkw.com/uploads/file/51384700972.pdf
    • http://kodcomputers.ro/2664/uploads/6322508371.pdf
    • https://anakmeong.com/contents//files/74624288671.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5de43cc34e---99202345158.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/885eab44a84ce554458d996b0afadd28/44013334803.pdf
    • https://hurtowniaroza.pl/upload/files/sodetirofaz.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/t843u8nlv5o5vl5s62c1vvg16e/vibivufulijurezume.pdf
    • http://iziusb.com/userfiles//file/84473745486.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/a42b5b4e7384fd94ddd8aa8cb88f542b/fasosa.pdf
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/cddbaaf2cd34d0fc65f165bfa8e5023c/gelabesigusazejevo.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fca0655c0---luwiruxuvejisogamud.pdf
    • https://taevlingar.se/images/pages/file/kekarilavotadatirijiw.pdf
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kadosaxuzojaremigawafiwa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=can+we+be+friends
    • 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_off0000de0e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0E 16792 bytes
font_01_sfnt_off0000f620.bin
7e510f7a80157e7f59e3c992dc990268d829198bbbc58c4b5e24b9585a3a05cb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF620 16252 bytes
font_02_sfnt_off0001200a.bin
15ec451a73a14b75b668717b61df571f714ae75cd1347f32c4c909ba025720a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1200A 10340 bytes