Malicious PDF — malware analysis report

Static analysis result for SHA-256 068d4bf208aacea0…

MALICIOUS

PDF

82.1 KB Created: 2021-09-16 22:33:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 51d5341956f5c6326bb7a5266cc2032b SHA-1: 0738f62aec488ba0bb8dd52e5640612be35a10aa SHA-256: 068d4bf208aacea08a66a91a19c87570b2aff768b112aa631f68191f22f38512
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting, indicating a likely attempt to redirect users to malicious sites. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://playeasypiano.com/resources/fck_images/4045771852.pdf
    • https://cicadit.ro/UserFiles/file/79617198865.pdf
    • https://hotelangela.hu/userfiles/file/97326347104.pdf
    • http://huyminhplastic.com/upload/files/94495467306.pdf
    • http://maekuangudomthara.com/ckfinder/userfiles/files/81142605476.pdf
    • http://www.contal-farmer.com/uploads/files/92550505734.pdf
    • https://sweetburden.com/upload/users/files/puzejisomasolugolav.pdf
    • http://riverside-plaza.com/upload/userfile/files/45524643023.pdf
    • https://sheenabusesandcoaches.com/userfiles/file/49323234874.pdf
    • http://interno-kazan.ru/upload/files/mivifezetuzas.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161341deee0489---dugufutarexadujukasilufog.pdf
    • http://geometrabottero.it/userfiles/files/gifatikipu.pdf
    • http://meubelenindex.nl/images/uploads/49626534751.pdf
    • https://pima-alarms.rs/slicice/file/28853254606.pdf
    • https://pima-alarms.eu/slicice/file/wupudelogomajotanu.pdf
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/rutolerefozasamo.pdf
    • https://szabobuszberles.hu/files/files/17426378488.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613de6394c839---20453933956.pdf
    • https://marblobaths.com/app/webroot/img/files/92364987036.pdf
    • http://prochem.vn/images/uploads/files/gizowadikufesak.pdf
    • http://www.lovebliss.tw/UserFiles/files/mitizuwedixexuruvafomuwak.pdf
    • https://siriusdynamics.com/assets/uploads/files/49786542675.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613380986bb0f---dibipafepawegabegebo.pdf
    • http://www.binghan.my/userfiles/file/sexategu.pdf
    • http://labuchedeberce.fr/userfiles/file/44417332404.pdf
    • http://dealershop.es/userfiles/file/80201524936.pdf
    • http://mobilahomedesign.com/userfiles/files/80151045889.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=cheat+hero+mobile+legends
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8d6.bin
d8f7e91d359b2078a4caebfb8180f6f357052a90845f8e70e21048ecb820c9ef
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D6 10864 bytes
font_01_sfnt_off0000f187.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF187 16792 bytes
font_02_sfnt_off00010999.bin
e7e02dbd9723ed5be5e29f6d34c5478069c53d05b4c007ae05cc6be0b37430f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10999 18908 bytes