Malicious PDF — malware analysis report

Static analysis result for SHA-256 a052870d39bf039b…

MALICIOUS

PDF

69.5 KB Created: 2021-09-29 09:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03f425f64a70384123c8077361c0444e SHA-1: 6379bcf1801e215e27de81ca77a641d4603d14ff SHA-256: a052870d39bf039bff99639c10852fd6ccbe1dfe2c7581e113719bff4caf478a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple domains, some of which are hosted on compromised WordPress sites or disposable hosting. The embedded URLs suggest an attempt to redirect users to potentially harmful content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chmelo.hu/sites/default/files/file/zimirujetidagozadekeki.pdf
    • http://image.dlib.vn/libedu/news/bvu/20210920/file/vufisegumagodi.pdf
    • http://dichvumucin.com/upload/ckupload/files/15747256401.pdf
    • http://modnyi-buket.ru/uploads/files/45412975525.pdf
    • https://dbjadow.pl/attachments/file/49131720417.pdf
    • http://imreelectric.sk/uploads/file/24872468255.pdf
    • http://distant-property.ru/fck_editor_files/files/susowasejigarig.pdf
    • http://pazarziraat.com/userfiles/file/wifagefegovomeruzapez.pdf
    • http://55pluscommunityspecialist.com/userfiles/files/85180525244.pdf
    • https://presentkompaniet.com/img/content/file/sufulevaguxifujatebosek.pdf
    • http://seidels-mineralienwelt.de/images/uploaded/file/rokuwakunuzoginevor.pdf
    • http://zuche0551.com/upload/file/xizagupavinomobasefewat.pdf
    • http://h-p-n.fr/catalogue_dynamique/file/24639746966.pdf
    • https://g-stampo.com/pics/pages/file/fupuna.pdf
    • https://bonaparte.cappencms.com/templates/files/70510228763.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1614df7c7befb4---geranomamuxalerefo.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e272bc2268---gavutin.pdf
    • https://ecoledesgourmets.com/userfiles/file/vawatinefoxamikarivob.pdf
    • http://pitchdecor-construction.com/user_img/files/20160075564.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161427ae4c00e7---23670709746.pdf
    • https://augsburger-dartliga.de/uploads/file/75430737678.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/322ca2df71b30de211f131fd65954dd4/riletonokumuvevi.pdf
    • https://kristaldicarlo.com/userfiles/file/medaginifopaladuxozepevax.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=workplace+email+login
    • 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_off0000af29.bin
e8b92b645852300830761b03ad9fbe65b3006f7293dc200dd176c5aefeb98f0d
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF29 16312 bytes
font_01_sfnt_off0000d8bd.bin
4b1ef91a3778f7ff09753e5690e79abc782055278e21ac0d1b8c355caca9219a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BD 10536 bytes
font_02_sfnt_off0000f0b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B0 16792 bytes