Malicious PDF — malware analysis report

Static analysis result for SHA-256 a157b0b56e067ab8…

MALICIOUS

PDF

95.9 KB Created: 2021-06-26 10:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cc4eb294535868d4d525ed42a630db52 SHA-1: 7e3617a2d93a683765ecdad0f1da256ba58ce6e3 SHA-256: a157b0b56e067ab8654ca372574918c176409bccc53ad13145e9d7b20ee035dd
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple compromised websites, indicating an attempt to redirect users to malicious content. The 'SE_INVOICE_LURE' heuristic suggests a phishing pretext, likely aiming to trick users into clicking the links. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://krisoc.ru/uplcv?utm_term=in4749a+zener+diode+voltage PDF link annotation
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/sapc2bjhrkehpuaa32crlo74fd/38732061880.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/jar959m8qp17luoj6bv149tc2c/daxanufoj.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/pilaxi.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/3b96ad9dfcd960303955d4f2b6a2acd9/lorofibinikovap.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/km1mtd071537rtk1ct2el354e4/dilawufevoxi.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/eb990bfd88fa11bd780979522727d2ce/34098720780.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/62796611505.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082599d1f924---41935720688.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/0moua8n6ac8m6tec5nnejvgge1/novinolizadiwipuxigore.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/fojojofuzorivadobipudifu.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/tugazadifeguf.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/87370415372.pdfIn PDF document text
    • https://clinicscrm.com/img/files/93459028235.pdfIn PDF document text
    • https://airshow-bg.com/file/7760480020.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/hr38695cdf2emi7k299kvdr87f/wiretewipuwepexoro.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/musetigo.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb2489a87a---25453907052.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0e8cc5818---15646621174.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/27547410533.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071034b48e6d---dupodapadidexadozizepu.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b32df884daf---57997922546.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/8231127994.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/npress8144gnmqehl7aapqursr/72933220758.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///66346613609.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE664 10628 bytes
SHA-256: ef9cb3762b8317832b8150813f4b9e515c324d6c9345d23c4b61aab86739cc68
font_01_sfnt_off0000febf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBF 21660 bytes
SHA-256: de49657586798714bdc4331992357e4c01258094bc7e1764782482ad245a4fc1
font_02_sfnt_off000138b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B5 16992 bytes
SHA-256: dcd2897790a96c9a8ee9dfbf2f7dadf456f85733b9a983c72ff42d3b35bacf73
font_03_sfnt_off000151b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151B4 2364 bytes
SHA-256: 21637ac39a5a5e7658cb8b060fda420b016eb5a4253f2abd075071f45200a9b7
font_04_sfnt_off00015c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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