Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2f0daa33ccc9e48…

MALICIOUS

PDF

82.1 KB Created: 2021-09-12 02:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a16c366e1b99bca7b3e06b6d0eeb3287 SHA-1: 5118028929ae8b8dfdb71bb48675ed7c9e6cd122 SHA-256: b2f0daa33ccc9e4865ac8d65decd167d47100bba0de7e9719f2fa1c184bff684
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains heuristics indicating it's a password-protected archive lure. The document body is heavily obfuscated, but the presence of external URIs and compromised CMS upload links suggests an attempt to redirect users to malicious content. The primary attack pattern involves tricking users into downloading a password-protected file, likely containing a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/g8nu1tsmtmf29e2hk7h8v6qld4/62442789698.pdf In PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/xavorakavezafetumidorozer.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/v0hia9895rno83qou6l3t3mgt2/sepenonesisusamaxiton.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/jewelipaxuxisaju.pdfIn PDF document text
    • https://renetravel.ro/images/files/57760389575.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/6020970586.pdfIn PDF document text
    • http://cpils.com/userfiles/file/94159481748.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/79452785621.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c070a65b7---wogegujabuvap.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/vidurugejodedizam.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///9063180817.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/zovag.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/makegasixusotived.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/54773620482.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/34090390183.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/muretoki.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1613d310481b10---43786714799.pdfPDF link annotation
    • http://intertexmedical.com/userfiles/files/purelibukiviwunef.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/repabixiv.pdfIn PDF document text
    • http://aven.su/userfiles/file/xezikewijivexejopivoxe.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/62453842171.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/guzemi.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210910152820.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1c9f9ede3---44767076721.pdfIn PDF document text
    • http://state-lithium.com/upload/files/lewab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=god+of+war+4+ppsspp+iso+file+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56D 10596 bytes
SHA-256: 5d5ec30e4dcf6d4007da10d79022870b6f2069f01a5e9a4cdf829f9dec4f37a6
font_02_sfnt_off00010dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD3 17304 bytes
SHA-256: 1ab0a4bf646a5b70a9424ce32bdf51ef20c2a36e99d135002058a323471f8f01

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