Malicious PDF — malware analysis report

Static analysis result for SHA-256 af64783563e82344…

MALICIOUS

PDF

76.1 KB Created: 2021-08-10 21:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b9affc9985c706aa7031cb8bc74f524 SHA-1: 61278347eb74e33b94738451a69644ca2a83674c SHA-256: af64783563e82344c94d5089d19e0e2d7b923c3a9afb22e95504bd64e19ff9c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. ClamAV and ML heuristics confirm its malicious nature, classifying it as a phishing or trojan PDF. The primary attack pattern involves leveraging these links to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://chicohigh1987.com/clients/47015/File/6507568503.pdf
    • http://bularz-auto.pl/images/userfiles/file/xijafifosizevikej.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/2c1c4439920028274f1ff65b5d5aaeb7/lelanedu.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/87in8m458acieeie0i4gojjf4r/serivevovavir.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/8e09eb01adfdbb86897a9adb840b94c6/61190123441.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/1l4f2fp6vv4lrmvl5n6a38ufg1/8464493012.pdf
    • http://emilygrilltogo.com/uploads/files/wetizapilugu.pdf
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jugobojiguvezigizijogo.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/80ivbo7acgch2os50e2tl8b8fq/fifeninepovibibel.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f00227ebd04---rutefofoledotiwa.pdf
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/88841473881.pdf
    • http://davidlbrooks.com/clients/868292/File/bapidufar.pdf
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/47927532408.pdf
    • http://hieuchuan.com/upload/files/mogusasoboteposa.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaaa80694aa---1057850861.pdf
    • http://suamanhinhlcd.net/userfiles/file/29259343831.pdf
    • https://togeltop.net/contents//files/16267872449.pdf
    • http://romanakladatelstvi.cz/userfiles/file/2720309387.pdf
    • https://epiphanych.com/images/file/gebixorir.pdf
    • http://solemarservizi.it/userfiles/files/tenumevebobakebewekowotis.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b5a89e4de---roxosuzibasodoz.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/53345adfe455ab5645ff8ffc37cac8fd/zujugodemefovozerak.pdf
    • http://fly.no1-yes.com/userfiles/file/89423944186.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/316u9ei5da6m6piairjhttl0p6/78005351337.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160befd5edfca2---rofibur.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=nfl+weekly+pick+em+cheat+sheet
    • 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_off0000c6b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B9 16792 bytes
font_01_sfnt_off0000ded0.bin
711ddd97367add89c4f2ef249b8fc233fc15355b068dac883d46e438c596125c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDED0 10688 bytes
font_02_sfnt_off0000f771.bin
2ee0612f729286938dbfe6d3455c8d16a972b8a13c7091d9d92de187a28110ea
pdf-font-stream PDF embedded font (sfnt) at offset 0xF771 16828 bytes