Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6f758bec1ad828e…

MALICIOUS

PDF

84.4 KB Created: 2021-09-08 09:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 254b41426ea1215da8722ebeec8a944a SHA-1: e48ab630c8443798af0a6af9a0a12cc729a0b08b SHA-256: c6f758bec1ad828efa892bbc1e1410810ecceff53557c9556a61f54a2dbc97f6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=reduce+pdf+size+in+acrobat+pro
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5096551221.pdf
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/15571065244.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a64e2dacc0---meguvuzujajudejufaxunegu.pdf
    • https://dm288.rs/slicice/file/webukalodokuletelajefeno.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/ace4cdb54b45d7f4548f91659527435e/12318870626.pdf
    • https://bisnismedsos.com/userfiles/file/36528288975.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c1cf0346e---banolid.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/43614c9cdbf59929f2f5e903f1dbcc96/duwutosuvu.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b273b1ad98---peropisamevexa.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6eae2fc3a---30922089848.pdf
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/lapolozuxudisu.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2ddd2a666---92804682246.pdf
    • https://tecnibat.net/uploads/archivos/99048951470.pdf
    • http://www.aqsclimited.com/EditorImages/file/1095213425.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160fe6ba7ba5c0---xaxagezedubara.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6f033ebc0---setidatogeliripepasus.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f139bd2f5d5---47587501094.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607417645904e---duzuwiruxade.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608986c481953---3148667810.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/24mrkl6aertik7eesjtrkhg1j5/morexipun.pdf
    • http://emailreceptionist.net/userfiles/file/jukaxojesemolewemisuleg.pdf
    • http://re-view.online/fckFiles/file/29862980206.pdf
    • http://tai-yang.tw/taiyang/upload/file/26128298437.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/40cf93c9d43a33ed515a74b42dba9ab0/848273725.pdf
    • 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_off0000e520.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE520 16792 bytes
font_01_sfnt_off0000fd37.bin
0c0dca91f9c04a7b369d269fbfaf324ed147514d71b85bc96af3dc26491e24d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD37 10912 bytes
font_02_sfnt_off0001166b.bin
a92369802b2e95b414ec406335f6b9eeb5a5e11bbd18e126ce6e7d4b2eb8eaec
pdf-font-stream PDF embedded font (sfnt) at offset 0x1166B 17668 bytes