Malicious PDF — malware analysis report

Static analysis result for SHA-256 a60348c360a616f4…

MALICIOUS

PDF

74.6 KB Created: 2021-09-04 01:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 778317cb75a6452be4a5ea314887ed7a SHA-1: 2deb62aefa9feadc3be0dc481d211f0b82e6f8d3 SHA-256: a60348c360a616f4f73f6ae751f57e7e11e64f42ade5d482d7b34eae72a5d444
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links pointing to compromised websites and link farms, suggesting a phishing or malware distribution scheme. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://oniceh.ru/uplcv?utm_term=causas+de+diabetes+mellitus+tipo+2+pdf
    • http://vnndt.com/Images_upload/files/71171282068.pdf
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebca22c914---zotewamov.pdf
    • http://cintabogor.com/Uploads/userfiles/files/tesaxowemaneru.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05dbfc5ebc---rurudugaromewakakol.pdf
    • http://stardentalcare.org/userfiles/file/dabomorozirunonebepifepe.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/1ce32affd153f648e7c76306e5e93111/68768706940.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094471e5f890---wikopiwa.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-8/20210508083301965686.pdf
    • http://yacpa.org/yacpafiles/file/26448645485.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bc3054f2b---13924521669.pdf
    • http://arkystudio.eu/userfiles/files/tikoreb.pdf
    • https://ntc-container.com/upload/files/sarigimebo.pdf
    • https://termocasasrl.com/file/lovaxosowitule.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/lbp0623p09sqmh8cl9vgci5aku/88274443141.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/eocc36bfk7k4vtj7t7ln8kglsm/babubabitujijumabusapepep.pdf
    • http://lycee-elm.org/userfiles/file/xaluwugufux.pdf
    • https://hoalavender.net/upload/files/84308239337.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160f1634d25af8---jokafibozatotovif.pdf
    • http://nsdadventist.org/FCKData/file/berewotowivemiga.pdf
    • http://ruizhishengwu.com/uploadfiles/file/031806331736.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/mj4veacc96mtt5fel5lr35urd4/49163168881.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/3b9f90cab48c98717db16ebb62259322/vunetusa.pdf
    • https://chptravel.ir/data/file/punorufosaboduzanizuwaz.pdf
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/5ad260d1c1e0f40d2e3f4cc86439f7e0/texopitekitefefifux.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_off0000c036.bin
1f3b504b2283bd6f243569a5f371c3d02d2eed85e3caa9a1c25916870a774e71
pdf-font-stream PDF embedded font (sfnt) at offset 0xC036 17452 bytes
font_01_sfnt_off0000ec0d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0D 16792 bytes
font_02_sfnt_off00010424.bin
b6554d621cd4763be6128851f3f1030bdb514368e82d4595cbd2c4696fa69a3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10424 10844 bytes