Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1c39da433ab71f5…

MALICIOUS

PDF

86.4 KB Created: 2021-07-07 18:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a3e8d99b3e6a1c2c1b5e425c5b75700f SHA-1: 5a37ded2bfba4045d5319c369661954cb570504d SHA-256: d1c39da433ab71f529461820c606591751e821acc3015976f996e807ec96b8fb
176 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The 'SE_CALLBACK_LURE' heuristic further supports a phishing or scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6d7ee076a---96945861649.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c983144a528---40272325663.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a8457e29c---xeruke.pdf
    • https://asthasupermarket.com/userfiles/file/jatijomavepik.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083b8f605113---66774381581.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607019de9007f---84969144268.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/45caa1074b93817c86593ccf0df15ccb/78181139416.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160be41a015cfd---duzamuxexukinafepim.pdf
    • https://maxflowfans.com/userfiles/file/10622051244.pdf
    • http://cerescommoditiesltd.com/Images_upload/files/salevumijifaxidaloki.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f2720d896---guzubat.pdf
    • http://seabeachthailand.com/UserFiles/file/tifotapebetusaxipovimokuf.pdf
    • http://appartenvue.net/appart/upload/images/21665392393.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079adc52ccbe---zokovawawekoweguxiduvul.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607df42967379---tudovewokiromabaxoxi.pdf
    • http://altinay-law.com/images/file/femulojigifituf.pdf
    • https://weddingitaly.jp/images/file/20770011007.pdf
    • http://strategie-online.net/catalogue_dynamique/file/xapopi.pdf
    • https://apskarota.org/userfiles/file/momomasijodojoze.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4a458f708---38316939822.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1521f5df2c---zejiripuzojorojakorok.pdf
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/62728720020.pdf
    • http://thaide.org/userfiles/file/91162248318.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=bill+nye+sound+video+worksheet+answers
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d734.bin
0f01670447f01ed4ed6c3b40403cdc6b2a63795e22f9ed86ba9c9ad9b425385f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD734 10856 bytes
font_01_sfnt_off0000f058.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF058 16792 bytes
font_02_sfnt_off0001086a.bin
23d07c0ab03e857fd2180e41515d1df632c49f90dbaf41a436b01a71c0ce63ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x1086A 17068 bytes
font_03_sfnt_off0001349c.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1349C 16092 bytes