Malicious PDF — malware analysis report

Static analysis result for SHA-256 11e18c3ada28ec82…

MALICIOUS

PDF

101.1 KB Created: 2021-06-30 01:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3397d3eb3e30b2ec129cdb5501d20e29 SHA-1: f021cf103ef3a02ed4c23c9dc9ecc2b3da187623 SHA-256: 11e18c3ada28ec8200ff1f3c01983a4715b55f482e7519949e29db5e4e37d7f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress upload directories and other disposable hosting sites. These links are designed to redirect users to malicious content, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9899

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 https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/0727t64e7gv8dgim29shchqsv0/livunalajowelasenedijipi.pdf In PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/bunsndqu1s606to0itj42thtd6/27435688177.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/b29dc80690f454b8142cbe2151f564de/11190149014.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/54067590270.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607075a97483a---mapemufexepabefixebirulu.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9781466075---36833716708.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/70608557274.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ae732ed8879---rovuvagobubosu.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/46ccf309cd11b49c833bb573661194a3/39647334949.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/8f9e95856d3a3d63e854cffbc8ff2f50/vibejatus.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/vidizubotatimusajiretuwo.pdfIn PDF document text
    • https://noventa.cz/media/files/file/16156673045.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d30ed858c---33732566799.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/49411166761.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608441117ca8c---wemobeg.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3f7ecd4d4---16732450333.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/sawexavadopeborolepudi.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/16bcadd5c28ac52db16c1c2d77c4afdd/95959102568.pdfIn PDF document text
    • https://diphong.com/uploads/witazaro.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/ebd5b832178c7fefc40dc8e3c30b6d41/92622293946.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/25650597294.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/cb8d9eee309bd71167e7fc4975e38191/zewubemak.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/tepodaxuvim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=moot+in+englishPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000f3e3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF3E3 26232 bytes
SHA-256: 5dbca9abf4dc30791270c59ea2152a901676e811396d402b4e2efd6cd8dd1010
font_01_sfnt_off0001221b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221B 10120 bytes
SHA-256: 3d8838ace9145b65c18d1494491f4cf8d46db8374db283d0c7904c0a2afca7fb
font_02_sfnt_off000138a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A0 22880 bytes
SHA-256: 00b7bb483e03f806362a716c55e7e163fa39db6e25064b2c0011bb8c431973ff
font_03_sfnt_off00016ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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