Malicious PDF — malware analysis report

Static analysis result for SHA-256 135c64c26df2403c…

MALICIOUS

PDF

106.8 KB Created: 2021-07-12 23:36:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f5b28299dd00abe01dbef7abdc37f6eb SHA-1: dcffa4989c356e9aed2b8dc0ee34fb4e768e9414 SHA-256: 135c64c26df2403c2c8d2f22111a978d63d558ae7fa71eb5af194f52f31254b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

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 http://pulsarvn.com/media/ftp/file/jidul.pdf In PDF document text
    • http://beachfirebrands.com/userfiles/file/vixena.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/6a8fb380f3b676dfc48939c0db8477f4/2631469322.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/62789322822.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/25146820223.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/lonelumezopogukivofuvagun.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/71423592771.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/fuxiwesef.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160cdde066f4f4---wexaxibax.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/mifatusixurivugekovoje.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/duzinajeto.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/e92d1f2cl5gt2isj3lcrou0j1s/4327312591.pdfIn PDF document text
    • https://werbemittelag.chupload/file/kowijoja.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/3d362189d817728637a40da87ac698b0/suxozolixupamafim.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/feifa9o2f4l1dn6r5a7c5etp1q/20889289717.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/582e6e3732a5435edefcb52363a9a3db/dasas.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/b370ef23c2deb6caedcece9109a4c498/tinegijibadolewod.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/88120010963.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/9ee5epl99p1h610tli7eeooprg/namepediwemaweje.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/58509147555.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/19176424363.pdfIn PDF document text
    • https://fallsplat.se/file/77394093258.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/3c72695230f8e2736a1016a27dc78082/jonizamepijeru.pdfIn PDF document text
    • https://ms02bet.com/contents//files/wevadinoxurugodiwadox.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/b2ddc836946ea913f4437a93734e14c0/993247704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=surface+area+of+cone+derivationPDF link annotation
    • 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_off000123d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D6 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_01_sfnt_off0001394e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1394E 19336 bytes
SHA-256: 1b56b1aa9a29479b8b3041c255be236919063d49d6cf9739b9df7dfa159fc0db
font_02_sfnt_off00016d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D0B 10496 bytes
SHA-256: 4ee54e2671e1e0a3585a7d55f57dd26e296fc31e11166076588bf1d902347ec1
font_03_sfnt_off00018517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18517 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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