Malicious PDF — malware analysis report

Static analysis result for SHA-256 e34f2ccb72bbb35a…

MALICIOUS

PDF

102.9 KB Created: 2021-08-16 21:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: b00235369c5e38785a2d5069b9c264e4 SHA-1: 33e19cc42cd3574099c54ef672eb14f54bb708e9 SHA-256: e34f2ccb72bbb35a80dbc3ed69d88745dd40772d3b6600a9ce955a555965aad6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://philabc.ru/uplcv?utm_term=how+to+create+a+normal+quantile+plot+in+statcrunch PDF link annotation
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/cj298hrr0ifrb1q4ks0td0e7g7/98955630779.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210801_A87974BC5CFAB550.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/nefurese.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076b14d46a6d---27618186473.pdfIn PDF document text
    • https://autoparkalbanese.it/file/niwufosigevapodu.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/18628678499.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/maxup.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/36c21f422a17f697f24388d7b5acbe44/kozodijusugudolovap.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/37900d4a2b2139a038d7227027de093a/81478611711.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/eb790b897d289002e189205464abe6fe/ruvodanasosa.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad074db8c01---garexugilujiwe.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611a589b56cdf---pufasavibitufibejezikoxi.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610dbac8d7735---65188909126.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b65b6bc0ee1---difedapazababiviv.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761c39ad1c3---lofexosoragadujuxi.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/27968045959.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfcad33903---28864910448.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/89713304262.pdfIn PDF document text
    • http://byecook.com/ckupload/files/44631564153.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021053013510173499.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/45fe0c3a30de183184bf346cc477b9f6/96938335848.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608127a7af557---95012270372.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/51603678995.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/navamelidaboluduwive.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/bigokakinukubodefezedifez.pdfIn PDF document text
    • 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_off00012c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C68 10960 bytes
SHA-256: 1741bf3b719640a7d5cd6699141b9a526c8abce3bdd27440e4f04cf08088c557
font_01_sfnt_off00014598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14598 17604 bytes
SHA-256: 9ec4153b3b40f80fb119636f5fa3dc8ff28d184ac99954326d3dd00112ce475a
font_02_sfnt_off00017403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1