Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd42b75b419e6cdb…

MALICIOUS

PDF

82.9 KB Created: 2021-09-22 15:10:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 570ffae475ec3f943d6da6cf7948dc60 SHA-1: 542d8a9e5079cf27cbd893d0653b635788861a17 SHA-256: fd42b75b419e6cdb0895a4472191ae5bfbec6a886ab63ff9acbd3408ada3180b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by a ML classifier and ClamAV, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating it functions as a link farm. Several URLs point to compromised CMS upload directories, suggesting a potential phishing or malware distribution scheme. The presence of embedded URLs and the nature of the link farm heuristics strongly suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://agrobud.net/uploaded/file/gotuvoziduzuk.pdf In PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/82103047085.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339b1cb7dac---4544258349.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/nevewova.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/nogetusifogupoti.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e79f784292---97567928963.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/17056857710.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/sakefigigaxenumibajesovu.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/natepumewusuvofikolagig.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/c4a3ce9a6564efeb3a3b6f78170f7097/sebonujujose.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/mesovivemapevis.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/zusovesovul.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/46597579634.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/74998837850.pdfIn PDF document text
    • http://artside.org/data/temp/file/1163487673.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/sibeladexezavuneriweka.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/tivolavaxulurawuforawotod.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/petasusinawowuropaxojiw.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/6641971193.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/fevinavilurelefuma.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210911071647618.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/46573268677.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/24234176454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=pokemon+latest+game+for+androidPDF 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_off0000e1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E2 16928 bytes
SHA-256: d2a6f4d151aaa27469da3b4820d7c4110ab70ad57e580a1ed8cea85519ddac60
font_02_sfnt_off0001259d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259D 10788 bytes
SHA-256: 33270304723301674f1d2d63efb6fe5c50c10f4afb7194ce599da53bde58d110