Malicious PDF — malware analysis report

Static analysis result for SHA-256 69341c97e2897098…

MALICIOUS

PDF

84.4 KB Created: 2021-07-08 04:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: fa4ba1f343af4a846bebcf53fc459aea SHA-1: 18516f75dfbecf9b4744cc03919a0c6547d01810 SHA-256: 69341c97e2897098a7a9b0031b6228911b2f160475b9bc23a6ea3b87d60abb30
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, directing users to multiple external URLs, many of which are hosted on compromised WordPress sites. The presence of numerous links on disposable or potentially compromised hosting suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://kemenyseprosiklos.hu/upload/file/94619110018.pdf In PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/wotirutawiwizab.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608133c64db6b---vosukadumo.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd3e9a29b1---81567031831.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/43145954957.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b216d36d2---11606033412.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/51180005939.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e603e64b7---lipamiwuvege.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/8s37mmljf4polb1en994hv1j5o/fofedodejenebefunifipu.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/34479787548.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/be0525778f750e8998c70f2a1614ff7d/84411740570.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9c90ea8e6---jikevenotugavowu.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/duwanuleludoxakiv.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/sarunavet.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/35oahtuij2njhthv2dp3bshlc8/garagezakape.pdfIn PDF document text
    • http://bjjiffy.com/upload/99236826036.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/4733759964.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/xakug.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/24041516409.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//65389291335.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3de915840d---sakisuzixepevamavavidozef.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/89617e5eea0c5a503095d659282f6f21/55494195801.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/972ee20c5cc9a9d40b246d9ec5ae54ae/67787498245.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/db29b3da98bfa288d0e8147ff774576d/80315095699.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=clarence+the+5th+beatlePDF 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_off0000e858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE858 17620 bytes
SHA-256: fdd5d1830c5f2a7c99a05f33d8ff11931317126649b2ec61cdc488104816d20d
font_01_sfnt_off00011549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11549 10252 bytes
SHA-256: 017c683b8c10b1f773d8c94d99b490a1a1ea83e3eba7e751374cc6f348e16cf6
font_02_sfnt_off00012c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1