Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd1a730916d88833…

MALICIOUS

PDF

71.7 KB Created: 2021-07-06 21:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 917d803d7eb7dbbadb083848476087b2 SHA-1: 4797be54ac2d24776a5b92fb0d7b306303e7d8d1 SHA-256: bd1a730916d88833fdd8aec15a46db97aea465ba128082ed80666d757c551844
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute phishing or malware. The presence of external URI indicators and link farm heuristics further supports this attack pattern.

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://garglob.ru/uplcv?utm_term=independence+day+resurgence+streaming+hd
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/434679b3705f11d95df3fe4fd863af10/daputivafizeriniwez.pdf
    • https://papiratisk.cz/soubory/26268956627.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/8t5bdoq3kjilphklbdlos37jtl/pebujur.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/4oh7ucb2iae86meph4b21vo2ob/gamal.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a05a096ea5---24260237317.pdf
    • http://artpolyclinic.com/file/files/63599119258.pdf
    • https://ludifrance.fr/userfiles/file/sulixakamugaturelumomopi.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc84128b2c---72461877734.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/6adp11ma8ead7jv108oltdpm20/63594538370.pdf
    • http://cungcapluonech.com/upload/files/vupubusiwazumuso.pdf
    • http://collegium-connect.nl/ckupload/files/35836713376.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/hai0ojkk5c697jih58al2o9215/243287399.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c647bb75f83---xizevanuzuzasavofetenani.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/hhckjhtv19bmdkf66g6o9mindp/51482601649.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/fcv8br4pe781vomo37ppgvsvpj/84489080620.pdf
    • https://a2designbg.com/userfiles/file/duwudabip.pdf
    • https://ivaco.it/file/37107360259.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b89cb1b799---fimuvilaturezit.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/2aff2664923657b00447bb8d2d7b1b52/sevoniziba.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086c5ae123b2---defasaju.pdf
    • http://eltonltd.ru/sites/default/files/uploads/gixulejukeludetewuwogados.pdf
    • http://dreamcatcherltd.com/userfiles/file/56158414101.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1054f893a9---5578301753.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_off0000b685.bin
66f2ca533ba7c948a723fe345bf024d94a19f0b9d9ddf1b0d247e36e651402a2
pdf-font-stream PDF embedded font (sfnt) at offset 0xB685 16336 bytes
font_01_sfnt_off0000e015.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE015 16792 bytes
font_02_sfnt_off0000f82c.bin
b7f6b0496ed98df71bb242affcbf7fbdada254928c8e3f90679c589eb2831d34
pdf-font-stream PDF embedded font (sfnt) at offset 0xF82C 10960 bytes