Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cab56d2aa7fdf7d…

MALICIOUS

PDF

88.4 KB Created: 2021-07-15 19:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ded87d1e079975da5e256e145356e9c5 SHA-1: 0dbf5d57af3b00cd7042d9e95fbc5973ea5562c7 SHA-256: 8cab56d2aa7fdf7d27036f679efd9e709d06655dc0c532fe1c756e46047732ba
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware downloads. No scripts were extracted, but the presence of external links points to a T1566.001 (Spearphishing Attachment) attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://ambvet-trefontane.eu/userfiles/files/luxobasomapiraf.pdf In PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e321b120ddc---96657634772.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a5aa4b58fdf---wexataxonamibefuruwun.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/71781166710.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/b67f403fb12bdeea8aaffe22ad782535/74301396814.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/0227e50c5033d261a068685e3f05d001/lodozuwebozebutegemog.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/06/07/file/20210607_190117_157.pdfIn PDF document text
    • http://twxcd.com/img-aim/files/65265510997.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/goxenedikutin.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a376b22c1a---jadaxavuxi.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a12241bd1---zivawudere.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/pbouicdsq6e47g3mtle0b4l0n6/70863902227.pdfIn PDF document text
    • http://area5srl.it/file/30563378874.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/makufawemitixezoluxot.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/42589297489.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/926742941.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/7907abb59eb477e3e145e9f78f19827f/digumuwetab.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/80115774136.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/nkt6t06i036g5nurmspggques0/lojinoxakivofiwem.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/17d5f1b38f0f83dfc34b5b86eb798fc0/talipiv.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/fa0dd165089f74556ad1360d68680f62/21147821128.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/21443047585.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/78200646596.pdfIn PDF document text
    • http://tcihk.com/userfiles/56804416111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=active+learning+constructivismPDF link annotation
    • 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_off0000f854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF854 10720 bytes
SHA-256: 9e07ce2ae6eebaac265dae61621e427036376679c2fe2ea183f13bd486e09e9f
font_01_sfnt_off00011102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11102 16640 bytes
SHA-256: 6e1f03b45e5c65bbe74070ceb7428f903e35a9da2c9324f413902e3f719af6b4
font_02_sfnt_off00013c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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