Malicious PDF — malware analysis report

Static analysis result for SHA-256 a627c58f42a44b84…

MALICIOUS

PDF

111.0 KB Created: 2021-09-05 23:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab6fc3aa155fde1714bb36341995c94e SHA-1: deb171191def941beb9679ccde8602408dc6e171 SHA-256: a627c58f42a44b84483023d2732227114e3d48bcf6d50ff325a3f81883df90df
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, with many URLs pointing to disposable hosting and compromised CMS uploads, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9873

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://aokman-drive.com/d/files/jifuvizasobodurovuroxe.pdf
    • https://urbanlivin.lu/userfiles/files/74925448841.pdf
    • http://ac-kenigsberg.ru/files/file/41598514338.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606d934ccbc45---banibavukiwapusenan.pdf
    • http://zjqzzx.com/uploadfile/file/2021061202321873499.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/068c849bfe6ef3f3814ec80537d1df84/87101513126.pdf
    • https://arerp.kr/data/file///76615741983.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/117fc68915358af03a63e4bd12ad7e99/42307978615.pdf
    • http://sclifeguards.com/clients/16854/File/96994514106.pdf
    • http://progettarecasa.com/userfiles/files/kenozosizovupimugazofir.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1608312ebe4209---puluworubawagaseje.pdf
    • https://cartolmania.it/file/xikuwu.pdf
    • https://beysukonaklari.com/ckfinder/userfiles/files/60807190531.pdf
    • http://x-site.by/upload/editor/files/51277294622.pdf
    • http://omonetach.pl/foto/ilustracje/file/wipidagararopuvixaxagad.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a776f0396db---nurorowasekegomekafed.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/712a1f10de4cb2d5e4d6f37f5b2d1399/wenamubanovuwo.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ff4a0c533---zekazinibadopikef.pdf
    • https://ajitcoatings.com/uploads/dunekafawuler.pdf
    • https://aulacvn.com/upload/fck/file/dupigonetusexelifeparo.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/61b2f9cb7bb4c0376403198c7d6fbc77/75492523297.pdf
    • https://rendiamovisibiliglinvisibili.org/file/64803355738.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5ea8e244def71def4f5043c9a2065237/xiduzotofelopexijogif.pdf
    • http://robbes.nl/media/files/jatupalaxo.pdf
    • http://movietek.vn/hinh-anh/files/pokonariwalugidilozawetuw.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/c995291a90bfb62f569003a2f03b4862/66818718293.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=macros+in+excel+2013+tutorial+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_off0001480a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1480A 16792 bytes
font_01_sfnt_off0001601c.bin
8788d155cf5bece6147117ba3e190e75f6509463922d39769641e44fec2b5fce
pdf-font-stream PDF embedded font (sfnt) at offset 0x1601C 19844 bytes
font_02_sfnt_off0001933f.bin
1ddb941e3b5d2bdb741fed270b1cde8c57805b39d4d3f8796c4d82e3d6c62d68
pdf-font-stream PDF embedded font (sfnt) at offset 0x1933F 11276 bytes