Malicious PDF — malware analysis report

Static analysis result for SHA-256 656a97ffba52b968…

MALICIOUS

PDF

87.8 KB Created: 2021-06-26 04:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19158e25b8e578d651e434f1b6ed93fa SHA-1: 8a6b820c33b1a5a25714c3a70af056e0b91cda85 SHA-256: 656a97ffba52b968d836a171bdce9c30504e404781fa2c2326570ada3d7e8e65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan distribution vehicle. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites hosting further PDF files. While no scripts were directly extracted, the nature of the links suggests a potential for JavaScript execution or further malicious content delivery, aligning with spearphishing attachment tactics.

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 https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074db877d053---77599749234.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608e471c80c5c---rumoditobizowuxa.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/eqt4o1alvpudv7803v6ajoa39e/komuma.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/7c39c984aa2b6892cc95c8177ae704ff/35425167902.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/hs1kcf8tj0e8ldrjk3fn63g538/89938129615.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16078052ccbead---gogero.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f33992ad3---sawujor.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/94bd50170b87366af8574b2e9de759be/fojexujuvigikanuduxobujez.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/c43bc10d3fe04f2c9c563641cd8caa84/48253927217.pdf
    • https://alatheir.com/atheirwsfiles/file/xuzadexifutinofu.pdf
    • https://abofahed.com/userfiles/file/57126963678.pdf
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/14929642276.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608778bd4b511---48949104722.pdf
    • https://namratalakhotia.com/userfiles/files/mufitetufiwerelabuzanowi.pdf
    • https://dineflon.com//files/55567262537.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/7984d68bbd1aca8d61c15a11a753cff6/lidovupozojunog.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/5i0k2uhfoak1jg4se9qvfo5vvg/nekatek.pdf
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/48629ccb504a39337a3b93f31c2c497f/82243783342.pdf
    • http://coming-c.com/userfiles/file/jisokujidolusefu.pdf
    • http://mjsolankifoundation.com/fck/imagesfile/4683673322.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b6be468ca---6720685585.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a33c588c9bb---viwogapexunol.pdf
    • http://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/dumegem.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=constantine%27s+engine+and+performance
    • 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_off0000f0df.bin
d6c4693d8f9f63869dd18ace2a2604894cc02ebc2cb2d9b869838faa7f11bf95
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DF 19200 bytes
font_01_sfnt_off00012080.bin
2beb98cbedd6bbf8719bfd942270222d06005aa58b0982a2d9250c2f1d283df2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12080 10984 bytes
font_02_sfnt_off000139df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x139DF 16792 bytes