Malicious PDF — malware analysis report

Static analysis result for SHA-256 5457620016854a77…

MALICIOUS

PDF

83.1 KB Created: 2021-09-18 09:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ca97253b5e2b85dcb9352b8e748e3441 SHA-1: 3805f5700a613aa257b9ec6116ec0b0e1690b122 SHA-256: 5457620016854a77cbaee2efcfa1d1763ab2b50fde0e77199035b5cf604ea4b1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, indicative of a phishing or scam campaign. The 'SE_CALLBACK_LURE' heuristic specifically flags the document's intent to trick users into calling a phone number, consistent with callback phishing or tech-support scams. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest malicious intent.

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 http://uts.edu.co/portal/app/ckfinder/userfiles/files/tifipaluge.pdf In PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/55131538575.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/parowelafeg.pdfIn PDF document text
    • http://labotinnghia.com/img/files/22759607150.pdfIn PDF document text
    • http://becucci.it/userfiles/files/34773248348.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143e3129ec04---5347316311.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/mowegeru.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/togefapepigafalagufis.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/94943358006.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091121252067.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/pibakezufi.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/pkvva0v46bmlarnt0ebhsd9jih/jowutelipalog.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429645c0e68---wiwesufunoxovu.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/41122838594.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/tizegavuxedirodigafisifix.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/nowagosutidujidivakofat.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/49796715496.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/37939866081.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/fanawuvowur.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/99473462921.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/542b5771c24dc08ffce0a63cdc49d0f1/51718819454.pdfIn PDF document text
    • http://mlight.cz/archiv/file/gefidapo.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/zafozajalapose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=mario+7+in+1+apkPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/4486134041.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_off0000e02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02F 9988 bytes
SHA-256: 437b8d68e60436450d6f2bfaec228d8ee2780841f5b26645fc857be52a5c0897
font_01_sfnt_off0000f675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF675 18752 bytes
SHA-256: 8d7e84e722426154cea9ef6bea0a44c83658ac9d8736602417a8a2d68efe61ed
font_02_sfnt_off0001270b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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