Malicious PDF — malware analysis report

Static analysis result for SHA-256 e720bc9feb5f1f28…

MALICIOUS

PDF

81.8 KB Created: 2021-09-15 10:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95bc8c6535ababd4bffc53baf39acdd0 SHA-1: 1a818799f5300e2cf39213e90855a46d0e07d15d SHA-256: e720bc9feb5f1f282dd525821ef9ac65d20d1c68291142df64b3886bf5a7a2df
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6964

Heuristics 5

  • 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
  • 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://laborke.ru/uplcv?utm_term=how+to+set+mp3+as+ringtone+android
    • http://bbfederico2.net/userfiles/file/risafujoliparafuna.pdf
    • http://panziofabian.hu/fck_kepek/79915622448.pdf
    • http://microsolder.hu/userfiles/files/tudisizisorusupukeluvaku.pdf
    • https://cdmsig2.com/ckfinder/userfiles/files/70868657567.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/465811e63ecd6a55c890244b97e2dd8c/64013078425.pdf
    • https://walkandsmile.com/userfiles/file/90034622331.pdf
    • http://nenorm.com/files/files/nedexibisodovokifejime.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613033465c1bc---31123214900.pdf
    • http://nissanotogovap.com/uploads/images/files/21898267583.pdf
    • http://czechdidgeridoo.com/admin/upload/file/puvap.pdf
    • https://taucaotoccatba.vn/images/news/files/60006685571.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/a90bc99fdde245328453befaff3b00fa/60110832434.pdf
    • http://bsa-billiard.by/images_from_html_editor/file/tizerobasolabovuxip.pdf
    • https://stichtingech.org/ckfinder/userfiles/files/ganak.pdf
    • https://jakspravnenapsa.cz/userfiles/file/79500759484.pdf
    • http://allineers.netlovestories.com/upload/files/62637291952.pdf
    • https://klcmekatronik.com/ckfinder/userfiles/files/wetimil.pdf
    • http://mosjob.ru/images/file/55323465846.pdf
    • http://aroma-es.red/yamituki-n/uploads/files/83427757983.pdf
    • http://dfanchem.com/upload/files/likolopirutimeweseki.pdf
    • https://rzfmuhasebe.com/userfiles/file/ronomen.pdf
    • https://kaparatt.com/images/File/33920975973.pdf
    • http://yuli-china.ru/d/files/nijala.pdf
    • https://angkalaris.com/contents/files/mafotuxamaguj.pdf
    • 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_off0000eb8a.bin
0f08cda283151a9dc75d4f6af894d6472d752664fd2dbc0b6a63ad781755eb8c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8A 10936 bytes
font_01_sfnt_off000104b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x104B8 16792 bytes
font_02_sfnt_off00011cca.bin
a4d0f149f3817348a6db35ceb46c8483a85d6af98c8e3fdd4804792f6b076489
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCA 17424 bytes