Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d7b53c58f587a3…

MALICIOUS

PDF

97.6 KB Created: 2021-07-31 02:36:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: dd0ecc70aa2eb54c86737a3cc35f3505 SHA-1: 7373baa16e2b2dbcc1212e3474b0a42ffe5bf680 SHA-256: 79d7b53c58f587a3b0a89935072dc0baf43c9674871e60f2617378b39c068da5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a phishing or malware distribution lure, as indicated by multiple heuristics flagging it as a link farm on compromised CMS uploads and disposable hosting. The presence of external URIs and the ClamAV detection of 'Pdf.Phishing.Trojan' strongly suggest malicious intent. Although no scripts were explicitly extracted, the overall structure and URL patterns point towards an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://philabc.ru/uplcv?utm_term=ps2+games+iso+for+ps3 PDF link annotation
    • https://clove7.com/userfiles/file/xevupo.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/nnqf0nu12hsu3fkegscq2shmoa/57440018865.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/jixasedazekogufex.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a609a1e0da4---94980477769.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac1b983905---komilugelorovenixuwax.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0903defaf---kugogogubigamipo.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/mipeximijekebigokatagufig.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/58866617850.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088e682df600---nusisufofaxixeduku.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b15377114b8---kekujigunuluzigug.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/3104860b01ab9c0a92707f4f674d17d7/63704124739.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1471c9bce3---jajugisobafilab.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/jubumobuxitaxanejudin.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/minadipubelenu.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/zexajewaxarabivu.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a754b972e1f---samak.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/dipiwopusubenuwez.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/0b61c1cbcb9ccfc733b2a0ebbaf2069e/97063395595.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/68008316001.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/mibelodotir.pdfIn PDF document text
    • http://learningkey.org/userfiles/xejalakukafilupululuvapa.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/564348190.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/fevetozaropa.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/73053994517.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/53011420951.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608257ca536ae---tivaselisegu.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://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF242 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A50 11540 bytes
SHA-256: 303efbb6d82436dba9bedb413d347b484da32fd1b11c0e8b7a9b751f95c56d94
font_02_sfnt_off00012f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F35 17732 bytes
SHA-256: 19c2bd15c03b3d9ccc8fd177c1ae3ac3535379f8c50138849a71911811db2c19
font_03_sfnt_off00015d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D54 10744 bytes
SHA-256: fdda83ed271aa6c0a722c0bc37261592b3411e1ae600ef96015d26d3e071cb56

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