Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b4eaa684591b226…

MALICIOUS

PDF

78.5 KB Created: 2021-09-06 22:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 88e22d7f82df631ca0cb8877b3b5b2e8 SHA-1: d3e39fbae9acb19f826c991f16624c42d4fb6600 SHA-256: 0b4eaa684591b2264033258f92f40adf4b5134b8afb1ce84121eb708dbfa9383
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which point to compromised WordPress sites and algorithmically generated URLs, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161236b455d698---jegujezewufobosozakuz.pdf
    • http://dgjst.com/upfile/file/biwivevakovukisagatal.pdf
    • https://festival.bg/fckeditorfiles/file/667323269.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/f5ffa1a445ce58e36d44bea3ef602754/divageliruriliwusukenib.pdf
    • http://bukharageorgia.com/sites/default/files/file/fibapebimitiril.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/b3dpnf6d5491n4d5uc3omoju06/39296000960.pdf
    • http://sumosushingrill.com/uploads/files/27575093748.pdf
    • http://apothepharma.com/upload/files/55319647933.pdf
    • https://ip-pharma.net/data/files/rifexuzinim.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f4ad36f7b---31261009215.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/7eeab8df9aec2d08ddcb73920763fc66/zipuxijifat.pdf
    • http://halaljones.com/uploads/files/relefowularisaf.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/7d958d8b4e7bb4ff9ba7d44d17f5a292/90252165212.pdf
    • https://tavio.ru/files/file/17253394802.pdf
    • http://gyobel.itpublic/file/fozivakokerixefovisabus.pdf
    • https://hse.tw/upload/file/kefirozulib.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a665145e2d0---saduwibenimaturax.pdf
    • https://sukhayurveda.in/userfiles/file/sesolinetezex.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2fdfb5804---310541898.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/vh3koarj4ie1lr5j48hq3acjh0/jotugofiwotepato.pdf
    • http://yaan121.com/uploads//files/202108082148351496.pdf
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kovasajobiko.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/38957158ca170bcdbb9d0012c110470b/tevavowazovejenavot.pdf
    • http://www.gulbaharsigorta.com/contentData/file/54320640445.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=world+war+1+books+pdf
    • 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_off0000cf8a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8A 16792 bytes
font_01_sfnt_off0000e79c.bin
e4dc3c979aa3cb679fc1be332f4249afeba6a6032ea35020ab8d87fa62d1a524
pdf-font-stream PDF embedded font (sfnt) at offset 0xE79C 17468 bytes
font_02_sfnt_off000114a1.bin
fc61ad3b6d381550fc846522b6401aa672e8485d0f37cb0b9e0a8c859f582ea7
pdf-font-stream PDF embedded font (sfnt) at offset 0x114A1 10428 bytes