Malicious PDF — malware analysis report

Static analysis result for SHA-256 241b4ae0b0687488…

MALICIOUS

PDF

163.6 KB Created: 2021-07-03 12:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7b20e6b222ccbbd800bae99fecf908b7 SHA-1: 143bfbcdeb2ffe6b9f45a33087a37c9f535f0aab SHA-256: 241b4ae0b0687488b19d76af1f5bc57ef307c43004a25df535783df70c471684
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised WordPress upload directories. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9480

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://cowmoo.org/ckfinder/userfiles/files/37755496252.pdf In PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160db2433a6c97---fuxoxanabusagag.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/r6nsoec3rapbbbamesvekj7454/bivozukikewej.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/51824555098.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/9ikb28ev9j9r3acka7pe1i18nl/10499076088.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/528d86a1e68be93da14c6490f5ecb569/64772236129.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/ec3dda8407f5834326e18120b7088f41/79527146555.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc0d9b893f---laderubobejifa.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bedb1743162---88420023906.pdfIn PDF document text
    • http://wwstationery.com/files/file/zuketovewewurebezuwosi.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cf42048cd---58153074641.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607225bbdfdfe---zowesukosaf.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28f0c49c18---monuzonafadoxidilujolu.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090719361543---gavilosavuvumapexunadi.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/27935003246.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/vemokodubofali.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e67c8046f---xavajagofenoni.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/5f28ba35d42d53721546a442f0ccb9a0/69297558712.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/lafij.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/46110574073.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbcedbde7e---rutoju.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/068c7785f15cbae7f07f1cc6a9e62115/larafidoxewaka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=calling+a+dayPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0001a68f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1A68F 33024 bytes
SHA-256: cf9cb755c1981729d4f3677a4ffa26d508a191b941f7e3b074cbf1fb10e02683
font_00_sfnt_off00018e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001e536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E536 17376 bytes
SHA-256: d66f0a1c09de9c17d4c81e6384971d0e1fdbf185aee5dfabc05b31c8f1a53520
font_03_sfnt_off000219de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x219DE 9952 bytes
SHA-256: 196d0d2ae92377d53ffd1f8e3aa1bf3125d00f04aabd11902807d245272df85e
font_04_sfnt_off00022fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22FAD 37008 bytes
SHA-256: de8b8b7a69fb34049dd08401c6bd30330e2c7b1d415b79e7569ad7a5287f2b62

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