Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0e690a4ddb55d52…

MALICIOUS

PDF

86.4 KB Created: 2021-09-06 01:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f392109ea649dcce53ea3366a93f04e7 SHA-1: 421aabf4875007a6023ded1130aa7e765a7ec0d5 SHA-256: b0e690a4ddb55d5247bd0c735d35615567f69d26678f62fcb1155afdb9512d63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories and disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751ca3569c5---60940567259.pdf In PDF document text
    • http://simoncaulkin.com/images/80840977273.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/rapujesobunawaloma.pdfIn PDF document text
    • https://t2sc.me/userfiles/wopomezuzewuza.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607de368ac47a---74469260702.pdfIn PDF document text
    • http://djapm.com/userfiles/file/14225887572.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/pafen.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/9530dd60291e8bdecae0689845e5f534/kusipaxamafolez.pdfIn PDF document text
    • https://mytopics.it/uploads/file/muvubu.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/pevuxobasatikejeneruweni.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/darifumajo.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/31138324488.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/mojh6pse4ibjce40htupsiml6l/dedonimemupogegukixibe.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aad21f6ca9a---22710937410.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/ckak2pve3j9q5m5lbsvk3jgrl4/87919926137.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/mivuguw.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5c06af3d0---56067799155.pdfIn PDF document text
    • https://geo-decouverte.kenamedia.ch/ck/ckfinder/userfiles/files/lemawuxuxivikav.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160749a8de8fc6---36304125621.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/zaluwuvizesozepuretuk.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/18253976083.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/31078865599.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/177547bce31cd65b3d5dd0488a7a6dbf/42199172142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=donald+super+career+development+theory+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_off0000e985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE985 11076 bytes
SHA-256: 2eedd801c7dffdfea4f2844e877163a8f11dac0d969bc1358d741076f6ff8259
font_01_sfnt_off00010332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10332 18888 bytes
SHA-256: 87b0fd1b7323141c035c98880d858863b008269a0a4d3327851b3a96578e706b
font_02_sfnt_off000133bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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