Malicious PDF — malware analysis report

Static analysis result for SHA-256 a667ffd0fb3294a6…

MALICIOUS

PDF

80.2 KB Created: 2021-09-11 15:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c72e6958d5ade5779279e48fbace6654 SHA-1: 91db4558af16b8c58a92812019866f675f3ab23f SHA-256: a667ffd0fb3294a630ca002538792196fe98af2e25ba8ac20478de17b8b8386f
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests an attempt to manipulate search engine results or direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://avvocatogiuliani.it/userfiles/files/pomevadasusodosinajus.pdf In PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/sidesajuxiduke.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/diragiwulefemidasufejun.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/47739183599.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b8f0ab5c8---zivitozif.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/38105535756.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/2e94416c80495d5f0591dafb00838e9f/zefumopiri.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138651f98aae---7751556276.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/56755164469.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/cf6a83f3d4976bedab069f3e51f907ed/pobewurimologiwowot.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/tebakonapowon.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/83623397004.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/wonefidemefi.pdfIn PDF document text
    • https://svltv.in/userfiles/files/pevitodufiwajutidunat.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130551d232f9---72287281679.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/14609350694.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134fa5f52bbd---57690109429.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612eceeb392fa---pokasufowaditomemebo.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/161303645db68d---55090192161.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/35058150616.pdfIn PDF document text
    • http://sakra.sk/storage/file/3401991002.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/49587479047.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/paretajaped.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=uktvnow+apk+free+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD519 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED30 10484 bytes
SHA-256: dace187cdb763190986b97e240e676ecbfebe1dcab8f99707619eafff035f585
font_02_sfnt_off00010537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10537 17868 bytes
SHA-256: f55184494caa1502b68d5086c379ab4a62f4264742a791819bb7f71c1b2ddccc