Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f3023d64d792cd…

MALICIOUS

PDF

89.8 KB Created: 2021-06-12 19:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc1d5cbac72d5aa47b152fcc44c7911d SHA-1: cddf4645b4c6daf4188d370d87b2ebf793c6ef1e SHA-256: b6f3023d64d792cd62a384964a0ec73973b590d8299a985d425765f13768a00a
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it functions as a link farm to distribute further malicious content or conduct phishing. The document body is heavily obfuscated and appears to be a lure related to a movie title.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://irlanc.ru/uplcv?utm_term=quiet+place+2018+full+movie
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/67e8b27cad83d90589feb4da20ecd3bb/63745158056.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fdcda8c8f39dd2f69967e89aaa31a460/jexobazowafitoxu.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85ac4474b---merorijomij.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae3c7efd62---kuvolajavovijumoroxo.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c823aa6073---69725443327.pdf
    • http://pajurioverslas.lt/ckfinder/userfiles/files/22154544917.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759b6176d70---lusugizifenilonevukatilam.pdf
    • https://picinterior.com/ckfinder/userfiles/files/dodakob.pdf
    • http://driver-jazda.pl/upload/file/5502748317.pdf
    • http://mientrungland.net/uploads/image/files/sotozapiwemezal.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbb92c75d0---purijafuvarotozugenuw.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b4c935c59---gefoforuleforag.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/8158f10ff834f5b7aa93516ccceda014/bafapavapu.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/oivcp96keb807aepbnechmulg0/33127245292.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a26e5cd23827de1154304c07a731487b/20362314239.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/kaoe1th75fnik4f8vteqld6g6p/veram.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013f8a.bin
1a1ee3b4b2da345adf10497b35cf037cd8f3fc1ac18ec2851ba7433d6e5dd73b
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13F8A 17476 bytes
font_00_sfnt_off0000f441.bin
a606a6dede3b99472d2ac97761204782646b5f75106b48d1abccbe9a99ca9a4c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF441 6440 bytes
font_01_sfnt_off00010435.bin
e2c9e6e4099ddb948070cc5e09c8b8e1da55151178714b1b4d81fdcfa37c0565
pdf-font-stream PDF embedded font (sfnt) at offset 0x10435 5528 bytes
font_02_sfnt_off00011709.bin
c744d1ea9a050c39b17b7134e86501fb268bc4078498c64c2b68d1e36b9c424b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11709 12332 bytes