Malicious PDF — malware analysis report

Static analysis result for SHA-256 0057c896e3cdf67b…

MALICIOUS

PDF

87.8 KB Created: 2021-09-08 10:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 76a6d10aac30cffff995eeaadf21284b SHA-1: 27ee8ebe303eca30290145264af9a06ce5dd160a SHA-256: 0057c896e3cdf67b782a1d014ab455448d58989a29b2a8804c0fa1d2493b0786
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=ysr+housing+application+pdf PDF link annotation
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/zodidawanaditate.pdfIn PDF document text
    • https://zold-kommando.hu/files/27470131111.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acf19ee25ed---zufisogomape.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160fc98414ba18---metigidawagubefu.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/d36330682fa18b511da19211731dbd85/wazukijewa.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160971b0ae563a---tumenujefijimopazitog.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160badca2d0967---falapomovixu.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/76911804412.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611be1f252463---9416487173.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/97190488838.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac45725b466---sexuzoketifusufozixi.pdfIn PDF document text
    • http://pololanna.com/user_img/files/dikegadakipurifuzuporifa.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19968046358.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/86343970978.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/vedamizovidune.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/negurukunusebuzub.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/29489178177.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/bv31nahrbsahas8g59rso3vstg/18251468200.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/zajaluraputis.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/j32eetne51vselgthhok1dr0gk/32122897063.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1bd02e695---11718805538.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/buzivuzago.pdfIn PDF document text
    • http://xmzs.org/userfiles/file/duposaremixivedonopabojo.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_off0000f4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DF 17212 bytes
SHA-256: 1f01032e5182cf58578e0088ff23e4b8ce0af921e0fd5ec9c638ca70a10df9d8
font_01_sfnt_off0001215a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13971 10852 bytes
SHA-256: 36058119a433674974fcaef6eb5c2a4110eae6625bdd39bd0fcc2715b1b4b97a

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