Malicious PDF — malware analysis report

Static analysis result for SHA-256 15ec02fe84d56db8…

MALICIOUS

PDF

83.3 KB Created: 2021-09-18 03:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e29fbc3fe4174c5338da3337638733f1 SHA-1: 8eaf5618a9aeaadfcbfa94b1268e9750ebf40ad7 SHA-256: 15ec02fe84d56db84722a2089da88545cacd8543f2b5063b4992ae95752ae0a7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be disposable hosting or compromised sites, indicative of a link farm. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a malicious intent to redirect users. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://inwebjor.ru/uplcv?utm_term=more+than+good+intentions+pdf PDF link annotation
    • http://productinfo.in/konadnew/userfiles/file/muzolisipusak.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/54646310770.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/waxepedu.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/40962178709.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/3383502571.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/dugibexetusaperet.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/649f393eb24abef519f9c56ed18ecf9c/gavozevarexewo.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/50665118070.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/19501004768.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/8256763445.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c871d3bbfa---pavutivukodaje.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/lojavolilizogozegaruwito.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/garotepamezinelizo.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/pamozejazi.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/zalalakikitafivemeg.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/17091383391.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/7974059515.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/pazolezabulonut.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/kagiva.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1631506085585742964.pdfIn PDF document text
    • https://viettrungson.com/media/Files/tekumudabo.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/98876682638.pdfIn PDF document text
    • http://happy-land.hu/editor_up/2774423369.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/jemer.pdfIn PDF document text
    • http://mfcpavpos.ru/file/90386164558.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/c3d483b28fd8052ce70228f1ee278af4/7253937273.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_off0000e087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE087 18100 bytes
SHA-256: 629dfe1f802fdc9d6809522c56f5e4549e567bcd3c46f071346610577734dda3
font_01_sfnt_off00010f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0C 10724 bytes
SHA-256: da1652a8dcee666473604389504f470391842a9da4adf1ed7a6c637a76abc74e
font_02_sfnt_off00012773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12773 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1