Malicious PDF — malware analysis report

Static analysis result for SHA-256 d35bbb23fffbb8c6…

MALICIOUS

PDF

86.6 KB Created: 2021-07-02 04:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0607dfcca555b7e0600a0b7a79b5215c SHA-1: ca598667886e51697ce002b4678e5c18908616da SHA-256: d35bbb23fffbb8c696fb1a069445505f32bcefbd0b41bf07f311f2c6e756d075
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites, functioning as a link farm. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/ekbn7jti94gjaokjrrd5otm304/jisam.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/d3a9773d1c15690cbd493ab6088d1b63/fobefexunowonorijebonuto.pdf
    • http://jhferry.com/data/fckeditor/file///37481212460.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b58c56b7148---21306983922.pdf
    • http://princeworldwide.com/multimedia/userfiles/file/64261613940.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2cc4f1079---65985489383.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/tpgdn50lvgvc3o53qhf3vnt1v6/pefarepugo.pdf
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/loxitasajuxuworexape.pdf
    • http://wowbond.com/upload/Fckeditor/file/94755890293.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d10ced010---sepipejixajijasus.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160761b53c5d79---79665268907.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/s87c3bcqqc38oh2u102ls5dk0c/fifukobidamega.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/1pg04tngoknucgl9mg7thb6tst/18205545457.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070c8a035c89---13762670922.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/4422d7492e806959f52eb09478a661c8/xabubatojew.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2dbeeab3f8---39709854056.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/vdmc20hu8id3q4h2vgjktlo2ep/65445635308.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607446d292560---18103655795.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9813dc712---migaxagelagaxesalanuzit.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d864c6712a---16441857785.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d8187a36c---98251138161.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2e1f53b98---sovesogukagebijidon.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160736adc805d8---rovezumamet.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/tb02roj5prq277kthh7d6f0t67/sinenobuk.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6280267a1---vamaza.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=the+knights+tale+analysis
    • 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_off0000f2d0.bin
f2e2084239f4e9ec07a294cbad60d4456595fd4bd2b3c28b2c6a3d7a9e61f126
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D0 16596 bytes
font_01_sfnt_off00011dac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAC 16792 bytes
font_02_sfnt_off000135c3.bin
afc9255c8590bc5bfb6c52aae2e67f2688c84ffa80e73a1b892d6c5486d0c443
pdf-font-stream PDF embedded font (sfnt) at offset 0x135C3 10336 bytes