Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbab055d537ce69b…

MALICIOUS

PDF

77.4 KB Created: 2021-08-13 13:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 402452c0204484f92c3d65ac05b00992 SHA-1: eaedd58b401f77906e8aaf52e2233212643d00c4 SHA-256: bbab055d537ce69b663268e0ce23b61c29edc62c774cbdf91037a1e061ed75ad
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous compromised WordPress sites and other domains, likely to host phishing content or further malware. The heuristic 'SE_CALLBACK_LURE' suggests a potential callback phishing or tech-support scam context, further reinforcing the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://inwebjor.ru/uplcv?utm_term=download+lagu+mencari+alasan+cover+faline+andih+mp3+wapka PDF link annotation
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4fb18d836---78799869634.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/9f461db0f38e777699bd5252d191c639/xufisefamaf.pdfIn PDF document text
    • https://komodovo.ru/upload_picture/76967092560.pdfIn PDF document text
    • https://pontus-sd.eu/uploads/file/manaje.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/xusesuwisogenuvelu.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079510967ae7---gutenigonuzo.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa071d60813---54692803475.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ff5bc7eb453b277610d7013d8cd31e85/tetiripewu.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/73727411327.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/96318808244.pdfIn PDF document text
    • http://tetedebois.it/admin/file/nefefopatuwot.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/24ccce1b35c4970e0d25d892746c2316/wazujazefomanotikuroniw.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c8e4d49c3---70264899385.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/ecb84ca33603344987e03eff5bef5edc/kumisiwixilig.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d87d1e8aa3---68324685714.pdfIn PDF document text
    • https://ebdaatcoop.com/userfiles/files/kogezivokoki.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/pozafoxefotizu.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ba0bs7omvmlb97levpraa3dt14/taruwibakuvemowimuxonuxe.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/d0j12o039jtr25m4618kqurcsj/dubamonaziwugilon.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7855795617---sonorupabaru.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/nupadobevo.pdfIn PDF document text
    • http://salinahighschool1967.com/clients/c/c9/c9c88be04994199279bceb128c91314f/File/jofewufigovidimatazotoj.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_off0000c7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF9 16828 bytes
SHA-256: f79fd389bae7153ab9e27a129f52b9064a6bd0f60a508624045dc2b0cd70f30b
font_02_sfnt_off00010bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB9 11484 bytes
SHA-256: 9ec65c4603923e293254344558652e7b18adaeb2e6d3f35b0c9265b8f12b37d1