Malicious PDF — malware analysis report

Static analysis result for SHA-256 989b25254b2ef4fe…

MALICIOUS

PDF

80.0 KB Created: 2021-09-05 04:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 478e92bcfac87be868d5d4b94e1d89af SHA-1: 853eb48436cdf925cdb45a87f4b5d4802be44029 SHA-256: 989b25254b2ef4fe654d179a42c8c37b78109efccfe89047181891b0d725b709
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the links and the detection indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/prfb93ml7af5b2jvtctl2ruf12/xoleritigowunanemunolug.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a024fe19977---vurelekuguxoxekododexira.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a61eb1899de---82092547355.pdf
    • http://innotack.com/userfiles/files/99120734624.pdf
    • https://itexpertdog.com/upload/files/gizejalew.pdf
    • http://www.ags-sib.ru/ckfinder/userfiles/files/75608106854.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/96f096676891dbca2ee3f0b52264958c/23397742009.pdf
    • http://schokobrunnen.com/idata/ranisarogokagi.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8a899d013---62316268461.pdf
    • https://gotamsui.com/ck_imgs/files/jegekotigegimave.pdf
    • http://vagtteam.com/userfiles/Files/bitejudazapiti.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c89bac3f196---balavudupexofodirutedu.pdf
    • http://kgmda.com/upload/files/vivelegafubinogaputofuk.pdf
    • http://heureka-cz.eu/files/bugigifin.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9198b43ca---xivazogiguwopovupuparakuz.pdf
    • https://rasorestefano.it/file/77613686576.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/ign1f6r9p1escoadu9o49ujen2/pibadamegisanimasuzaxex.pdf
    • http://intertexmedical.com/userfiles/files/25456315077.pdf
    • http://normel.org/files/upload/file/76210214755.pdf
    • https://leciv.fr/uploads/FCK_files/file/81244077556.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/58c43a14c420a0194587f79419d21f2f/kopuzenowuxutida.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/1vcuhmq3pt93cposqpe4914m28/37519773449.pdf
    • http://artkulinaria.pl/sites/default/files/file/navoz.pdf
    • http://stlnsk.ru/uploads/file/temodinajozorut.pdf
    • https://dgssu.com/upfolder/e/files/20210622164751.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=mechanical+design+of+spray+dryer+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_off0000d45f.bin
d6d77c654fceba43c190626e64f7a1383146feacf0f5e9634ac82f11752bfa74
pdf-font-stream PDF embedded font (sfnt) at offset 0xD45F 10908 bytes
font_01_sfnt_off0000ed51.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED51 16792 bytes
font_02_sfnt_off00010563.bin
24675cfd5bfe89a5a24e4839dd6aa2b0a3a5575055954c1ef38a3de660266690
pdf-font-stream PDF embedded font (sfnt) at offset 0x10563 17580 bytes