Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d57ae80ef85bb6…

MALICIOUS

PDF

87.6 KB Created: 2021-07-20 05:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c081bc64a27b892bf923f64f86202f84 SHA-1: ddd025b7ba24b41f3825074f1e47143a986882b5 SHA-256: b4d57ae80ef85bb62da89b56f5b6388eb43f510a785d080b569fc655a4663d96
164 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and other disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The presence of a 'download' button heuristic further supports a deceptive user interaction pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cd482473f---52530570489.pdf
    • http://www.ufolep-69.com/contenus/files/vutupewumo.pdf
    • http://meble-tk.pl/userfiles/file/51303718119.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/ur12crkcu4lq672dfq8qtpjovc/79577978965.pdf
    • http://ei-windykacja.pl/upload/file/menivon.pdf
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/85866427374.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/a6o53919ghu3a56jbd0qhtt7cs/45228409443.pdf
    • https://angkorphotographyguide.com/userfiles/file/23442657848.pdf
    • http://aarogyamedico.com/userfiles/file/11467714769.pdf
    • http://www.hussco-steel.com/husscofiles/files/podin.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a12b3c00a11---39811707253.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b4f749cfc3d---lafokamuluwegiwumiratav.pdf
    • http://cadelupo.it/userfiles/files/jamesapizuguniva.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cc5baba56d630546a5a78ee3ba994c04/29454213775.pdf
    • https://mytopics.it/uploads/file/wodasuvinelilotujesalim.pdf
    • https://pabrikangka.com/contents//files/kutiwedezamubabo.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/muatu928tbulgh88nrllj8hv2a/tisarozabetujixujorawumuv.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c74307bc6f6---36118966255.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/qfuk92d98nkbn0scldqkuqehqj/rorefikanigufumomozutezo.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/2e81fc43dce3b00d58cce41dccd3f527/jivaritanubiba.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d033e1f559---xekowumagugiwomixas.pdf
    • http://kistours.hu/userfiles/file/52721063556.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/df0c43dd5760050696cff8482675af18/34360375432.pdf
    • http://fittbikese.hu/files/file/fasenozizamifelunurorote.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b9197eed9---fepuj.pdf
    • http://toshiba-center.ru/uploads/files/zorodasekupu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=mine+caves+game
    • 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_off0000f53e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF53E 16792 bytes
font_01_sfnt_off00010d55.bin
9e0e38ccc02931c83cf004e63905f3e1d0cdf678b498a24ac7afd6685beb943c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D55 10268 bytes
font_02_sfnt_off00012468.bin
bedaa09492d21011275646c4f4c83f87d123e8aa31d49feb2c14fd5467133608
pdf-font-stream PDF embedded font (sfnt) at offset 0x12468 17048 bytes