Malicious PDF — malware analysis report

Static analysis result for SHA-256 6842eecead5219fe…

MALICIOUS

PDF

84.0 KB Created: 2021-09-16 18:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ed5ec1ea0262bafa9eaf1ca39776c2d5 SHA-1: 11c528f3aa80fabad0ef12b38ebae2c84c89e596 SHA-256: 6842eecead5219fed3634018d8c0121c7a34a49cb6b995bd7aa2359bee20079e
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, some of which are identified as compromised CMS uploads. The primary goal appears to be directing users to download files from these compromised sites, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://birkhoffhi.com/userfiles/files/karubutitibe.pdf In PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/kajujunotetewewemadan.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/a123019b7b5302030350c3ad91c78a80/57824149351.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/fadofitovubutofugifadarej.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/likubetukurup.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/vofebirilafepusulin.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbbb885a22---nerubi.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/44617570127.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/87785368834.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/bavikugegipupesamixus.pdfIn PDF document text
    • http://okgwa.net/50/files1/file/87291103380.pdfIn PDF document text
    • http://systempro.kr/userData/board/file/78659791956.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161346d4c59eef---nelel.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/zopufofazefimepaludalazu.pdfIn PDF document text
    • http://findusafranchise.com/files/files/80971583756.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141a766ddbf5---82365763137.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/fuxunodivazuvubisof.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/57043011191.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/loforixuwixofokokal.pdfIn PDF document text
    • https://thepainter.asia/upload/files/42618212373.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/banevipujabuj.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/1310a1c13789714c10089ba918e8166a/79388110103.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/jutisawurafukutomi.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/movoxanidesu.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/62453317346.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/21858800772.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161409456088ef---xidiraxafasazekosabu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=idm+free+download+applicationPDF 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_off0000e40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40C 10648 bytes
SHA-256: cea412ec5acbfbb091af529b76f594a359c01ea5b50ea7de14649f23677da1f5
font_01_sfnt_off0000fc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001147d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147D 17208 bytes
SHA-256: 2c07a7e5b11d1d5429004c0b12957c1385ad6c69060c004195d019bdcb948778