Malicious PDF — malware analysis report

Static analysis result for SHA-256 356b559f018562c0…

MALICIOUS

PDF

91.7 KB Created: 2021-09-05 04:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a8442389e6aff08649a00a4cea2c96a2 SHA-1: 9e3adf0d77cf6bd45a5b9240b7b4a0bcf5e846a8 SHA-256: 356b559f018562c0a6f0494ed5a340f90592586b41ee564f1dbe722e0e00cdc6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content. The primary lure appears to be a fake download for 'thinking in java 5th edition pdf', directing users to URLs like 'https://pistant.ru/uplcv?utm_term=free+download+thinking+in+java+5th+edition+pdf'. No scripts were extracted, but the heuristic firings strongly indicate a phishing and malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=free+download+thinking+in+java+5th+edition+pdf PDF link annotation
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcba8f3d8c---gogivaruxukeram.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/46767936607.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/dedixal.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/45512761541.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/vixetegafogulo.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/891f5f5f2f74d4e4c40aab765ec5eb15/kuvuxa.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/89321683914.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/77050114391.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210816112649.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/3c05785b23393bfa1402ad3ac06ab8ec/51789473173.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/rovedobukoxonibe.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/33606505990.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/77460794519.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/06c78ccadc2168725826a8856080e16b/xopuvatawabelomufibatuwej.pdfIn PDF document text
    • http://kisito.com/userfiles/file/11125408636.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/0d326fa8c4e94b9d66876bd8c4273f0e/xizobupib.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/4859807221.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/68979994778.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24f97ea3e6---zudidalujabusefejos.pdfIn PDF document text
    • http://thaide.org/userfiles/file/sisukezituza.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/b41bc5dc6beabdb202d755ba567661d8/jojebevikubixavezimon.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/74153301179.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/hbnte8k8i48sjfucr34dvi9fvv/luxaminafefuliwadaxa.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/cd08ee66c9d4bfd4f30fe14b13243d76/41233734476.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_off0000fd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A8 19248 bytes
SHA-256: 5392b8d9b5576fd4dbc87cf59794132dc6e6839f19508f4fcfc6834b4357da18
font_02_sfnt_off00014751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14751 11092 bytes
SHA-256: 3b6ec6dfea411e92288efe3da51d599bb4fc6b223f9835589715d0394593e05d

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