Malicious PDF — malware analysis report

Static analysis result for SHA-256 39766b4dea63cab0…

MALICIOUS

PDF

94.2 KB Created: 2021-06-27 09:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1b5d75ec082e20201dc9d23506b0adea SHA-1: 6f0c4d45f07962433af2b809b25d9f1e07c83f3a SHA-256: 39766b4dea63cab0ab48747740fda42ddf283acac00b6ec3b8a027ee8a2f9534
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, which are commonly used for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://garglob.ru/uplcv?utm_term=most+sessile+animals+living+on+rocky+shores+are PDF link annotation
    • http://shannonlakeestates.org/fck_images/file/14208451877.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984c61b2630---vunoperedixipe.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/5c230c4199937c2eff460af23d4381f5/sexifoneduzivovutolesupaz.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/68852031164.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16096a46598b53---48180238548.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/fenolijekowekop.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/1fa89a11ee20373175fe6e448e2f5132/879900674.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/31348272902.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/banizozibe.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/limop.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/240ef35e7c11dcb03c1f338f9eb2efd1/ralexupasuvironekipexom.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/706b60cd67ldp97htsj812r1n6/19963672393.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a60ca7145---dupijujavowosijib.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/46cbac9a47f99b0d0279bd2efbfae2f1/pajiwerologo.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b678c953ae---nujudufigito.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f8cdba197---67505291387.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16088915267c9f---55440153035.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1501b85b87---xitajuj.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/jrvmhlna5j9p8sjc1th3rb6ai5/96955425051.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/2779a00545165cab2bc23e63613d8337/91900295716.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160934f893a754---lavutexepapoxabidemunas.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d81ba3eebdb---witixazufawilapebu.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/f6v79kesdu34j3vb9rg55kcjpo/dozabujokukebavilipix.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_off0001104d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104D 16244 bytes
SHA-256: dbc8055aee94e01463e754990ca86bec32ce8abb595780f6be58904e999458cc
font_01_sfnt_off00013a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15251 10940 bytes
SHA-256: 7a874b7a6ee8ab88eb5c74f135905caea9ecfb2b0bb3cb3ecb39f82179ef2c6b

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