Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b47bdd9f1329e9…

MALICIOUS

PDF

85.8 KB Created: 2021-08-17 22:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7167d3adbb0fec318f3bd3e05996d204 SHA-1: e87bd97e0a82a2a2ceb760ffe665553ba495d2ba SHA-256: b3b47bdd9f1329e9cfec32f1c447fa570f2bcf8e1a84ab9b25f0a5fe33a87bfb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely intended to lure users into phishing scams or download further malware. No scripts were extracted from this sample, but the presence of external URIs and the link farm structure strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crewmak.ru/uplcv?utm_term=sub+indo+you+are+the+apple+of+my+eye PDF link annotation
    • http://nuraski.pl/wsg/userfiles/51818403542.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/5us43vn7cfq114r7407a7mmqsc/jatuvevalopaxaseju.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/dunavexedik.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/eg73m2vdfs6ghaju8bclmn9l4u/80142220940.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a95b2a389---83820017847.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/ruwanumabudulun.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/lcihn6jcmljt7vhdb51la7nk4f/tonegetiwufabopuseru.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/fazosepuxorogimebutezaz.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c620b09ea---20318878491.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f3f53767aa8a65b8a4c5dd9a5e5b30a1/7089586158.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/71583314838.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbc9170c86---36080527480.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/dukaziluwopa.pdfIn PDF document text
    • http://thomasbelldescendants.com/clients/40432/File/31966048384.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/83967005957.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/86154923222.pdfIn PDF document text
    • https://gilbertems.com/videos/file/3014075554.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef4675214d---92711784671.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/sagejemabevesitubavid.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/xojasesuma.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/276ba27cb6bd3000cd413505d107e23d/marutesa.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/febegumubigijezufu.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/c36be9075feab560f81f210e3a0cb3b6/90821133197.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/zorulenasutikatukagexod.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA3 11024 bytes
SHA-256: 19cbfe0151ed889a95ad485e7dc4bb15cf93c9da054d634e024430e8fef27dd5
font_01_sfnt_off0000f5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D7 3772 bytes
SHA-256: d8eaa1aaf09fa77700473d68c71aa0c627e78a0b2a41fa7834a7ed45313116f0
font_02_sfnt_off00010483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10483 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C95 16932 bytes
SHA-256: 31b299c412d159021c37ca4f8d7644b4da0783a993381a67db2c1e83d76059b8

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