Malicious PDF — malware analysis report

Static analysis result for SHA-256 acbf48e9f28de68d…

MALICIOUS

PDF

99.9 KB Created: 2021-06-28 01:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 089c8b0f85fcee3ef630238c2e6e9b3b SHA-1: 6a0f778d7317e06851a52d153e1457e4c9f3015a SHA-256: acbf48e9f28de68dd9e660e7605c62b23287ac9405ee322eca31a4837b6c4209
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be part of a link farm hosted on potentially compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=india%27s+most+expensive+city+list
    • http://cedule-plachty.cz/files/file/88963489041.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090b66eee67a---ziroxafigul.pdf
    • http://murielbellhomes.com/userfiles/files/wurukupoma.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ba3c24950---zabifonuxakegilimowosumul.pdf
    • http://sdds.be/userfiles/file/93659305398.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607893c050b73---nalewijironijomagul.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/f3a1851a372b7249c5728333819bb583/semafo.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/iofeu4estr17ki1f3c7m486urp/15513719158.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160787752b1a31---gotibet.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/bc4aa7408ab9e9880b8165f8c5ba9978/xesikekagedufasuxa.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16097ca77597a2---kesogufusi.pdf
    • http://kiiga.ru/userfiles/file/gikigoj.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608091932cddc---poxolawekotepaziruruvig.pdf
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/38277910732.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b881778fd83---11514559763.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076042244ddf---nofavisuf.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb63c875f6---linarezatodif.pdf
    • http://misosmile.com/upload/editor/files/pumakavexegomero.pdf
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/86004405175.pdf
    • http://sicilyontable.it/userfiles/files/68620461983.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/a77c929abcef8a8e781f38b3e4976794/83616641601.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d34ef399b79---24785804993.pdf
    • http://irths.com/upload_files/files/guwetiseginarivamawokoj.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9cc36a67c---71704270250.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_off00012271.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12271 16792 bytes
font_01_sfnt_off00013a88.bin
ed1f7774aca88b2bd00ea79ff59c12b9ec54cc76e86d88aef9e8b7befee7c568
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A88 10840 bytes
font_02_sfnt_off00015397.bin
ad1d25115e78966aa94b90ccfc0f5bccb064ade7e497aad63c78b55fef31be33
pdf-font-stream PDF embedded font (sfnt) at offset 0x15397 18104 bytes