Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a7ab40ca499be2…

MALICIOUS

PDF

84.3 KB Created: 2021-09-06 20:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a9d8d8c5ae2665cf587fafabad414317 SHA-1: 6305cac59e9502921c45a90c2bbaf9745bd00a4d SHA-256: f1a7ab40ca499be2bf9a383374dd0db7c60e4ef25b8000af1497f483cbffaf94
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to compromised CMS upload directories. These links likely serve as a distribution mechanism for phishing content or further malware. No scripts were extracted, but the presence of external URIs and compromised host links strongly suggests a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://nomylo.ru/uplcv?utm_term=ivy+global+sat+6+practice+tests+pdf PDF link annotation
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/de7373373f9463fdd5b108bb0049dbb9/karasepaxirirafovofosi.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093521df1961---zipiluwakirusiwuxesas.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/51359450810.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5239b89ad2---25307542677.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/piruvegi.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a11d10248dc---rezumejupanogileladin.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/xesigazonidunewizejureki.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210708064556_otg3ij.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160f78481ded61---6467342935.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/50346386245.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/wezufawewo.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/ad68b51ed3d105a032265ae264a0bf2f/majituridaj.pdfIn PDF document text
    • https://maria-galland.ru/files/file/jidolejeboliwaboxigezibi.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/kamawuvu.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210820_8C5EB43DD2A52DB5.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/sovokesojobosobazotatidej.pdfIn PDF document text
    • https://europartner2.pl/uploads/62567292027.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/2b4ffe610c4a44177b3b396abb32e487/nelirawewilojub.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/57377714965.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f27ad3bb3---43708437701.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/fd3c370bf585e7826f24af5e518b20fb/32409700807.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/wopobigulubukujujafadegax.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/a37f16b7e51f4a5b052472f38d9b6d47/51005943708.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/vuxafuxozusawijobabogim.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_off0000e2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC8 18028 bytes
SHA-256: 0c56de80c035540180a34f7ad8f52184c90e49e368d92312352c020347c9d359
font_02_sfnt_off000129f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F3 11132 bytes
SHA-256: e2f654a17c78921256b098282d536f4af1671a4549f0df782f1eb0382c30e57e

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