Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed49c1c46c90831b…

MALICIOUS

PDF

83.5 KB Created: 2021-06-26 06:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3878e58d8e3c31473f25d0e3bacd9cc6 SHA-1: 67450d7ec31407f5d41bb009f6d93bd9d317aee2 SHA-256: ed49c1c46c90831bbad219bf27a0ba3136c2fa1676aa09b97697ea69a3e4e505
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload storage, indicating a link farm designed to host and distribute malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160830eaae5ad1---desesufarub.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb5c371abf---nenejuzatakukekubomawepis.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/ac8bfahv1244ag66iq6r6qu884/99430278578.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/147e302b168c9366c8bf2bbb604f1596/82184857417.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/nccrfajkg76bb1792n2e6ss36r/kiwuka.pdf
    • http://optikametuje.cz/userfiles/file/78237920645.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160933ff37562d---sapogugesemuzib.pdf
    • http://optykglowacki.pl/obrazki/files/sudisur.pdf
    • https://chaplains-camps.org/upload_picture/file/tisoxojuguzavujewakarov.pdf
    • http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/takipoxol.pdf
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/74664294873.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2460e7e71---kuzuxigafewenutepobemesod.pdf
    • http://akinmedical.com/uploads/file/wuwijemipifoji.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/79be36a652f3b4a9e1bb0dea84ba817b/70047125743.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/pueeqoj9rkptkbg1nc8ggn0ki2/muvovadopifuvetaxi.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/3ee65436b57c9a6178d9744717fbac72/netuwafik.pdf
    • http://alumcity.ru/userfiles/file/82548057635.pdf
    • https://anmimar.com/royal/userfiles/file/59686123596.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2085dfa3a---52463840117.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/0665f0d9e0a45f7ddec653b6ddbf23a4/pelakodalix.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aecb06bb41---69296375258.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b35358d50---bubatesure.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=download+mp3+let+me+love+you
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cce1.bin
d8313c11040dbef97935bc8beaeb2ad90862dad0c87a83c97369860e9ccc271f
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE1 2792 bytes
font_01_sfnt_off0000d88f.bin
cef871173b537196aaa80051a39e3c0151f66719ef5b2b569c37674b8e9e7c52
pdf-font-stream PDF embedded font (sfnt) at offset 0xD88F 10732 bytes
font_02_sfnt_off0000f14a.bin
18e5a3dcc2389e63f076c4292554a26597de0e025df83d85245c177eb46445a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF14A 24004 bytes
font_03_sfnt_off00012681.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12681 16792 bytes