Malicious PDF — malware analysis report

Static analysis result for SHA-256 70c1582aa4052862…

MALICIOUS

PDF

82.7 KB Created: 2021-09-04 13:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 20294acbbf0ed06f365056195f34e780 SHA-1: 35dddb03933d06932d1ddbeaff00a4d96ddbe1c7 SHA-256: 70c1582aa405286240ced3a9a0b93214b3db69a0f375715a5835c9ed7cb65a6b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF containing a link farm hosted on compromised WordPress sites and disposable domains, suggesting it's used to redirect users to malicious content. The presence of external URIs and IP literals further supports this, likely serving as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e23ca4e983---24875773141.pdf In PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/326470eb0b9ffbcc394e368419c55c0c/nixikokoga.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/odctpuc45emg73gklvb4a78tbu/pubikexinasaxewafukes.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/lizabiver.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/49cc38b005d6f26835e04d84e3dfca7c/20516325607.pdfIn PDF document text
    • http://jn-zhsc.com/upload/56491209259.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/zubawunaja.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b45be8a7bef---sorosomiruvekul.pdfIn PDF document text
    • http://yjccnc.com/upload/files/fowafumanominolupolinogo.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/lajurerumoriva.pdfIn PDF document text
    • http://umhouses.com/uploads/files/32683915385.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/0c3a7h0dcvb4rf0boehakhaj4o/sivepo.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/pabevotuwizo.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/26565073834.pdfIn PDF document text
    • http://malifer.hu/upload/file/23093386131.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160716921a8545---37149139783.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb2d7967b2---nunekiran.pdfPDF link annotation
    • http://brucemsmithlaw.com/clients/e/e2/e252bfde01ef004f685a9648d307a4b9/File/3727423450.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/95074728561.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/49544481028.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/19154344987.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/82959360780.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/b873bb3de1207b4b18095838231371dd/wavewiro.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/23879061889.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=amylose+vs+amylopectin+pdfPDF 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_off0000dcb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB1 18328 bytes
SHA-256: 945339ae5da6cfd507d9e1f0a828530ddbf99eb9125dfc8ded66d9a77c3b3dde
font_01_sfnt_off00010bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12415 10844 bytes
SHA-256: 32330d94f708fbcca2e2097fc345932bdfb7c07a6c5c7d23dee9dd349e8ec84d

Open this report in the interactive analyzer, or submit your own file for analysis.