Malicious PDF — malware analysis report

Static analysis result for SHA-256 5889673ff3649070…

MALICIOUS

PDF

82.5 KB Created: 2021-09-12 23:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2650e73d5d0e7ce97fdd1d1aba6bb076 SHA-1: 5c9552cee3ca42bf3a2433f2f9a4ce51279b894c SHA-256: 5889673ff3649070f21861393e6a1cdc298b2b7ce18bc829bf662094fec0c1f0
156 Risk Score

Malware Insights

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

This PDF file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and disposable hosting sites. The primary purpose appears to be redirecting users to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://solemarservizi.it/userfiles/files/nogorinuwunimelubakeserov.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3005370ed---bodagazikeluv.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/kavejexupesexin.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/ff372c547a556da6d4e46d500c1e6a54/gakuwomuxabusekudugaza.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613c74999a751---12617707874.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/41382987660.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/fd45ad7e976418db12b9e2cb1bd17e7d/12576890926.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/ab670beaab68ee3c1fe8075f283a5170.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/zewoxetigewotekiwamalolon.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/xunetulokamifegukifoj.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/20332198740.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/52703106302.pdfIn PDF document text
    • https://wrd13.com/force/file/90746272888.pdfIn PDF document text
    • http://benetalent.com/upload/files/lixogowe.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/fajukup.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/rakatidelegul.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/setefopenaxarojo.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/tibilajukidumivujilokan.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/jen5f3pv7eqntn2gr0rf5s81d3/92961693786.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///rovifenuzeje.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/pupagol.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133793238d73---82405611864.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/14001316316.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/botedotokefoseji.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/53644096679.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e46c98c7f---82547446561.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=android+make+font+biggerPDF 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_off0000dcbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D6 10696 bytes
SHA-256: a42e2affecf2f9d1a07a2586bebfa22002b6523a431ab7bdb89c28723c556925
font_02_sfnt_off00010d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D27 18284 bytes
SHA-256: ae99e728a55021a6b41a49c31a27271002ba4ff627601bd8c2f83bc2bdc73ea6