Malicious PDF — malware analysis report

Static analysis result for SHA-256 841f4d9bd2e10d5d…

MALICIOUS

PDF

89.6 KB Created: 2021-09-06 11:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3c04af2fd07dac03779e437ecb000e44 SHA-1: be2941d07a2179289a7803eba4946342462a1af8 SHA-256: 841f4d9bd2e10d5d1c515dbfba20a5cee87401874ba6400a0229d0224421a72c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external URLs, many of which point to compromised WordPress upload directories or are hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body is unreadable, but the heuristics strongly indicate a phishing or malware distribution attempt.

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://allytemp.ru/uplcv?utm_term=artificial+intelligence+a+modern+approach+solution+manual+3rd+edition+pdf PDF link annotation
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/aueak11vbg2jtnfrjnsnq2irc5/relezabutokadefopijigoki.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/f6fd169f3033d748538ce1e186b883f9/vimarelete.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210817_CAC2C04E7F8BDFB9.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/vunuminidoduvaliwuviseve.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/64672358364.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e39b9d3a57---timibupifixumozefatus.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/7ill14itag23tcehjnjd93jja1/13701384057.pdfIn PDF document text
    • https://coil.hk/upload/files/28644983200.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/0554d4311f42d4bb5d967283f2a17c05/64764781151.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/57548218417.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/9948922029.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/witaboxeduwagotarurib.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/ruvawoli.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/a4051d7a60217875ed2b7d8b223e533a/40032597610.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/89740661562.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210806_865745C6661F1A9A.pdfIn PDF document text
    • https://capecoralliving.com/media/file/soxutikagomapezove.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/a6c5cba8b50ab3a72ed3bb5eadd5950d/guluzazamokabu.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/8f3iasgqj2q9pj8pmuqj6vv554/livivekojunavozotuto.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/66233871693.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/l16d8akaf6600e9deo3a8lu8cm/51680536347.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c11a3f15605---83990821485.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/29a5fac865ee6729c73155dad1742c8b/lasaxemigazetaviwi.pdfIn PDF document text
    • 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_off0000f5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B3 18440 bytes
SHA-256: b4d95ee91cb4fc5fde64e3b02ff0e129054a795969cf48474145d7373d4a08b6
font_01_sfnt_off0001258c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258C 11320 bytes
SHA-256: 7275fd9a84975a35644820b865ce0a3fcba3bd6029387ef69cce4dba1121ce43
font_02_sfnt_off00013fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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