Malicious PDF — malware analysis report

Static analysis result for SHA-256 038b697b4e271d95…

MALICIOUS

PDF

86.1 KB Created: 2021-09-16 18:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8c80f1909d5a4beaee37015bb9b75e63 SHA-1: 0d00ec5ee47ec49c4c8e859784edb6fc96b8247b SHA-256: 038b697b4e271d954f49636bdfbdbaa51bf3ecfcbb30a5b93fae2d16cbdbcb9d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by a ClamAV detection and an ML classifier. Heuristics indicate it functions as a callback phishing lure, prompting users to call a phone number under the guise of resolving a billing or security issue. The document also contains numerous embedded URLs, many hosted on disposable domains, suggesting an attempt to redirect users to malicious sites or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://queure.ru/uplcv?utm_term=usb+connector+app+for+android PDF link annotation
    • https://ysh.my/userfiles/file/50339018915.pdfIn PDF document text
    • http://abbaorphancare.org/survey/userfiles/files/79299167328.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/rebulep.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/jirurilujabifedid.pdfIn PDF document text
    • http://sdes.in/uploads/60163500879.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/figifolikonasilupelorad.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/44189112420.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/ravifetunurivijagalefuxep.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/64567395364.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/59661035874.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/nituli.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/liwapesupesotet.pdfIn PDF document text
    • http://devveb.net/userfiles/file/79924717371.pdfIn PDF document text
    • https://trystsalonri.com/images/file/92599134601.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613516b155fc6---bokitalumepaz.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/25753460468.pdfIn PDF document text
    • http://unseretochter.ch/images/file/8715989581.pdfIn PDF document text
    • https://edex.co/userfiles/files/bewilijo.pdfIn PDF document text
    • http://saktigroup.in/uploads/vipami.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/xizitamot.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/52031245469.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/9573187170.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/riwefugurizojazegi.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131269371ccf---22380299965.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/162f46f7206829852ae2bbc73e2a6b9f/10491951105.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3A 18056 bytes
SHA-256: 010ab80c89b9d2f81fb225132c79c52ac118ba9b4ffcc9fa460822b1dbca5173
font_01_sfnt_off00011a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13230 10716 bytes
SHA-256: 8c3c031be74f49df0d3cd69a901b271f72b460020e2c58a10eb30fad2468272d

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