Malicious PDF — malware analysis report

Static analysis result for SHA-256 4400d00a02522327…

MALICIOUS

PDF

87.4 KB Created: 2021-07-04 00:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 00dc10f60ca70f0ae394bc658bee3d14 SHA-1: 83011a96bea6f237acd6abe69db9dcc938e6628e SHA-256: 4400d00a02522327aac02aa15bd5bb2cd60763d3041e12bebeffd79a0fc48d52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised websites that host further PDF files. The presence of these links suggests an attempt to lure users to malicious content, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608556baa35cd---xutuni.pdf
    • https://foundryindia.org/userfiles/file/88094575562.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e76ce4c49a---gidov.pdf
    • http://vom-ragnaroek.de/uploads/file/86739654086.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bd65e0b82---duwatoribamagefum.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/d0a7c395bf89af4560a86e15df200374/mirebipivokarogatuwefimit.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/8a16050169ad1ca8171473a76111c71f/disilirinenene.pdf
    • https://hgindustrial.eu/userfiles/files/fodimevuwivaporagoreg.pdf
    • http://thaide.org/userfiles/file/66597922041.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/50141f5a34fe74ff894630c632ff497d/96999612932.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/6a0dcb6fb4520370eb0f6655de2d0604/biwitogubakewurumezekamo.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/eo1gffvk1176uqme7sgsltdqu3/36861535496.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/h2n6g33b2jajhu682htcpf6mv2/tejuj.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/16a06vn6mrkoi5o9bel5nsmv7e/68072422199.pdf
    • http://okzawidow.pl/img/upload/files/zavifasavopegane.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/02206c8fb8904d153de6063557f3fa19/71246689683.pdf
    • https://prawobrzeze.info/userfiles/file/62684697191.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16077c79878c92---gefebetizirasetodizixex.pdf
    • http://bearcatbb.com/CKEdit/upload/files/pijivunesoruzusor.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/587ed0d348dc56afec968b14c91829d8/6793309534.pdf
    • https://cmsschoolkg.org/userfiles/file/21918978281.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cf20bf065---xezuxepewifebikajolowuk.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f31208729b---93444228858.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=worksheet+on+number+system+class+9
    • 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_off0000ede8.bin
c9f933b6803a3405ee07de3f5dc02b803bf8556b2908e99c94d43503e170a71c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE8 11008 bytes
font_01_sfnt_off00010774.bin
fd87f81fe668db170e0394d24226c07b206f5d3eda9b05a5c399caa49c304df8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10774 18320 bytes
font_02_sfnt_off00013840.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13840 16792 bytes