Malicious PDF — malware analysis report

Static analysis result for SHA-256 3558230d23ab4187…

MALICIOUS

PDF

86.4 KB Created: 2021-07-09 02:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ace12c943d0d0fb2945cd18f0e1ca2c SHA-1: 22bff1eddde8197f36f2f5ce7f6d1963b3c375b5 SHA-256: 3558230d23ab4187c4d27e032c60b8f7ab1ede12dd5016c8c37c8a466d75b100
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. These URLs are likely intended to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/302cb7b9b568d13384f13c6e37b2cf31/vikadeperenen.pdf
    • http://qunjl.com/userfiles/files/geluwadukonifen.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe6851790a---10151184489.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/4444d555a3e0720590c65624a645e532/mutojasujodurorimusux.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/1cd7a3493a8c2c9733260b733d3de000/42187174932.pdf
    • http://kap-group.com/ckfinder/userfiles/files/mepalosaw.pdf
    • http://ahdongjiu.com/upload_fck/file/2021-5-17/20210517151517512231.pdf
    • https://chetanaus.org/bheru/uploadfiles/file/meganupewonopivoxexade.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c16a26f5a8---62548438131.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607d43404e272---30881476898.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a613aadae---41421027978.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16081921ea7d11---61831992923.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf8ce20d50---97948069222.pdf
    • https://dialogueinpraxis.net/files/docs/siluvezomodefozumutumuk.pdf
    • https://ahreco.com/uploads/news_file/rebemorakom.pdf
    • https://driftwoodcc.com/userfiles/files/banalituzivobufidazum.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/6k25hp032sac4krhmsi8rbqbgi/benelumedumisiliga.pdf
    • https://melz-feu.ru/upload/venepifozavoza.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5a69ae0a3---61003766441.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae479c1002d---zatobavulaxugivovisabiga.pdf
    • https://oteaexpert.fr/cite_imgs/file/43611303416.pdf
    • http://hong-tour.com/FileData/ckfinder/files/20210703_1A12D05D1563C809.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=scert+text+books+free+download
    • 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_off0000ee18.bin
fbf064bf042a6721cc22b081470a1a84e67a0ca9160e70fbc7b4d7fc3090175c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE18 10872 bytes
font_01_sfnt_off00010776.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10776 16792 bytes
font_02_sfnt_off00011f88.bin
08ef5dee19c718c007ff3ead4b1518201af7717537a8641fe4556ecdd5b625f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F88 16700 bytes