Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbba9029dd3248ff…

MALICIOUS

PDF

86.7 KB Created: 2021-07-19 02:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: baff0127bcb23f8789c6d65998897cf4 SHA-1: 2e1e186ce37987bd851a6adeaca73fc4b5e16240 SHA-256: dbba9029dd3248ffae370eae448164db83588cd0f957b918936e0716f344ecc6
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/c5mrblkfomuflag4fi00kb4338/vifixogejive.pdf In PDF document text
    • https://unserbiokorb.ch/userfiles/file/jawagogodajubinobepipow.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///febusabapi.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/708b484455791292fc622d57eb2440ab/senebaxituzolirumop.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/tagawu.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b515d0ba9---41619355386.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/pixumesevu.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/74304314023.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/75987538558.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16072437eab116---feniwawabovotikes.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/fnqvbmhsn21dltah835tlpit63/fuwavipipetizaritomevojas.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/65222325049.pdfIn PDF document text
    • http://kunbot.com/upload/files/43752916845.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e64ac727d---79616727979.pdfIn PDF document text
    • http://limoride.net/gallery/file/suzaferifenukote.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/jatuxovujenosema.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/63759613032.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/ronajomazovataluf.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7b91a9300---9746207805.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073dafa638f2---dasefelinatajaxiver.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///todimowosutotidepa.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/68973407515.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5eb9bd2a8---79241910183.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/mojazigijerovafuwapowe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=seroquel+common+side+effectsPDF 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_off0000ef36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF36 16824 bytes
SHA-256: 1aacdee49dd355260b3514acb742717fc2dcc385f40714e82a590fbf5adefeaa
font_01_sfnt_off00011b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13365 10796 bytes
SHA-256: 341d86aa039a43839d03d986d2fa530dc87e911b568a062bdf90d46b566beab9

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