Malicious PDF — malware analysis report

Static analysis result for SHA-256 e63c40035cfdacde…

MALICIOUS

PDF

116.5 KB Created: 2021-06-28 23:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13d983b909d6f57bc4b4a40c408f7bf3 SHA-1: 9c7f60fd29190e14af9541b22c73abeb26152419 SHA-256: e63c40035cfdacdec016c1403cde188839b7cf08ca8148b022b0398f3f75bf0f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics point to the PDF being a link farm hosted on compromised WordPress sites, designed to redirect users to external malicious URLs. The presence of embedded URLs and the nature of the heuristics suggest this PDF is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095cf4a16022---55508747389.pdf
    • http://urbancollab.com/userfiles/Proj_Name//files/dojev.pdf
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/8866324610.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bca84ab9584---nemakuwuduwepu.pdf
    • http://netinflux.net/userfiles/file/29703251505.pdf
    • http://fygl.net/uploads/file/211406069288.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/bf8f567bef928fd4c55ddc39298c6094/14428334496.pdf
    • http://movitecnic.com/ressource/site-image/files/74965250621.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/nedematumikatig.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/9300afbd1b95444b1b8910cdcb0d4224/50982815856.pdf
    • http://divorcefinance.nl/uploads//file/mexawev.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609456aada61c---befosaxodimatuwupul.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8c2ed5ec1---31993537693.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070863f264a1---soxikiz.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9eef87ca9---9058397336.pdf
    • http://ekolojikweb.net/upld/userfiles/file/8424178667.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/44b127db4f1df5ae2d5d8ccb1a11a0a0/latelipisorolalo.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1609467ef0e592---vubozexokixiwafile.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d073b33bfe8---5465501134.pdf
    • http://ypdtools.com/ckfinder/images_store/files/82684599850.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607100f5017b2---gamenogafuwujofaxe.pdf
    • http://mya1fc.com/files/ckuploads/files/fijixuvonoxukidugeweta.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa87512ce8---kuvigikiwavusomumi.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070c6a4509e7---96479266437.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/fedodabi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=padded+blouse+designs+images
    • 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_off000167f3.bin
829e69a8d53248f05a4662aa93fd0a7baeab5e59b7e0313148feebcb79d14b0d
pdf-font-stream PDF embedded font (sfnt) at offset 0x167F3 10632 bytes
font_01_sfnt_off00017ff1.bin
d4075a92a4703c6d085c89cb5f81424a30b432d0cfd9eb5e23294acb7826447c
pdf-font-stream PDF embedded font (sfnt) at offset 0x17FF1 16624 bytes
font_02_sfnt_off0001ab13.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB13 16792 bytes