Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a9fb043f2d7002f…

MALICIOUS

PDF

77.2 KB Created: 2021-09-20 05:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c5ffd97fe74caa7616f5c838e7ee8290 SHA-1: 09e8bb2e88e3c2dc8525ef20c523fa6fd40e3cbf SHA-256: 8a9fb043f2d7002fe155984092a74c50a5432956d3e09ca00d9676f56f58917c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The file's structure and embedded links align with techniques used to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://irlanc.ru/uplcv?utm_term=dise%C3%B1o+de+circuitos+electricos+1+luis+antonio+maga%C3%B1a+pineda+pdf PDF link annotation
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/60763780891.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/b19e30e2129148b670e6f9cca2bdd4b0/tekipitetevevitugibaju.pdfIn PDF document text
    • http://xn--12cf1djdb6cbcafdbu1f1cudgcc8am4wf7htgd9de.com/ckfinder/images/files/baxaromiwotujinonigivewup.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/75393552800.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/10504853361.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/fewexezujuxi.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/wikutegowuxibep.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/vomugomolinufavutot.pdfIn PDF document text
    • http://flirdining.com/uploads/files/pitenagoresedokumitobe.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/27614796696.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/rikefufavamakaxedavebipu.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/q0m13umdrgjadfugsqil92utrs/fofetoruvebizukix.pdfIn PDF document text
    • http://alcantara.cz/data/file/zuramumi.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/pemifamivu.pdfIn PDF document text
    • http://showpelec.com/data/file/20210919_194859_936.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/madexitijanatit.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/jutafebotaforanajikusodu.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/599a083063723268a5c2ff0515cb19f3.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/tipavuvokego.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/55573835390.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/15079069486.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/36415108695.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/zarazemogumodokikiki.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab2b1bf6be---20473502577.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/69331069677.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/23925006786.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_off0000c307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC307 18300 bytes
SHA-256: a0ffbc30051c6196425f0dd6f53874074d4437b61a2f29652dfdb77effb34da7
font_01_sfnt_off0000f107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF107 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001091e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091E 11320 bytes
SHA-256: 87a0dfac10f86af350440073d1cac71541c9d5d0589095bc33a422ffadd5461c

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