Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c1870626b107b6c…

MALICIOUS

PDF

83.1 KB Created: 2021-09-12 07:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b6a7646ae5f5b7486cf96a3e98711f70 SHA-1: 3400133aca10eb8cbff74448e44af8e04502f27e SHA-256: 9c1870626b107b6cacdbe2919a29adc41972dc1f3ab9b70675d0c02a11aceb7f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of numerous external URIs and a link farm indicates a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://dla-pracownika.pl/pliki_user/File/16000873985.pdf In PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210909_207B2093EA514355.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/vavanizuzipudigoferugopen.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/2eda1c4d6364a3b8579bb77aeb1dcbde.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16136ad7765975---tigifisuredemedawub.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/fonaxorewapuwudakej.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/490c38fe99fed0406850677f7d5d6b89/79283940976.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/43636473035.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/74855449740.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/xanelatujade.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/52278207796.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161349c194b40d---49402731838.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/60845739099.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/15545776571.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/vozibivi.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/kanajitukepatuler.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/poxozotokelenesuge.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/gutipuvotomar.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f7a456d9a---momotagixatakujaziferuliv.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/da16rrsoo5ppgmrhbph7l2lr17/silasitadojixoguliw.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/72614131709.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/wevagitasefu.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/31031761037.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/6214907390.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=my+days+of+mercy+full+movie+free+watchPDF 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_off0000dd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1D 10996 bytes
SHA-256: 25f2b1b1fee82620182aef8f0d8b806a766bb135511e4a1a3ef0561ffdd39267
font_01_sfnt_off0000f6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECA 18708 bytes
SHA-256: 0380d20127b5fd8e05becef6052a1329918832adc9b79ce05844483101b75f5d