Malicious PDF — malware analysis report

Static analysis result for SHA-256 d18eef218e5e7ab3…

MALICIOUS

PDF

75.4 KB Created: 2021-09-07 01:36:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: db8741253b1e0ae3dd218d14c2f70270 SHA-1: fe8f249457f3373a2d44b987fc2e641a45e6174b SHA-256: d18eef218e5e7ab338019c91ec6b4e4668b5f6f3442da0522a51cf9edeb022bb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the presence of many external URIs and the 'PDF_RANDOM_URL_LINK' heuristic suggest the document's primary function is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://maintogelonline2.org/contents//files/17141583170.pdf In PDF document text
    • http://mazdooradda.com/userfiles/file/zelonaworejipizopolotav.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983361a4e56---ragixudofofituzisemujivej.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/15553426258.pdfIn PDF document text
    • https://tavio.ru/files/file/tazawogedoj.pdfIn PDF document text
    • http://veterani-pushkino.ru/userfiles/files/46731133469.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/varefexe.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/fja11gcp17ruv71l18stebdrm0/46798881890.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/17369732802.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-2/20210602223526836775.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/56171007160.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962830bf098---37091168763.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092084f2a34d---zomuxuvorovesizup.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/806802f373216d8adeb01503bff7c566/nurodaviviwipufisa.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/13604c51902bab668eb8884088495268/11856587995.pdfIn PDF document text
    • http://k1a.ru/images/files/file/lojute.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/nidipodewezuxeka.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16289216268438.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864cd86fa30---fuvufeturikazorejuk.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/68919263684.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/tujowagutoveduzigemafup.pdfIn PDF document text
    • http://ksboutlet.com/file/files/35229099388.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210901170556.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/53628195825.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608ac0d212c67---37641510554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=capsaicina+pdf+galenaPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC385 10508 bytes
SHA-256: 1265b3dc321d42263c4a8d0ec652b099521975dab0c833158bf0b90fe32c20b1
font_01_sfnt_off0000db52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB52 16828 bytes
SHA-256: 00eb9da16085c79eb42cef864fe73b627b94c6dacf124c84eb4b12d083c62edf
font_02_sfnt_off00010787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10787 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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