Malicious PDF — malware analysis report

Static analysis result for SHA-256 de896d1f4b9bf85d…

MALICIOUS

PDF

77.5 KB Created: 2021-09-08 02:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 04599b938167d2a49541176ca2e44d1b SHA-1: f89dda8f1662822d5cb68c2e3552ef732d704253 SHA-256: de896d1f4b9bf85df3078d98e7cd1c695ebbc0bafe4109d2560eb98513863465
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://allytemp.ru/uplcv?utm_term=converter+word+doc+to+pdf+online PDF link annotation
    • https://aymexco.eu/ckfinder/userfiles/files/notititusisuxotaluwogoduj.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608853b56f1a2---67943987017.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/5466091182.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/f7177e943b696ce965f11fd3df5b5ae7/71988189174.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210822053405.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/3lumd6oac83th8abc3437bgqnn/34078578980.pdfIn PDF document text
    • http://centrons.com/uploaded/file/2022232630611e3dc10163a.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/g7dkqcl83c7hg85g9082v403l5/fewodazogu.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/jevevubejosepubuwugemator.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8465ee4a8e---silulalenovekolugux.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/39153503009.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/wadubopoduninokuwosi.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/timutamibixobafemokori.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/tuxavitomogavodewale.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c20ec80820---56123754768.pdfIn PDF document text
    • http://taixingchem.com/uploadfile/file/20210808002139825.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/waniw.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/89943831049.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/sojkjlhcdfb45njr5ple0f8nhj/lamulavi.pdfIn PDF document text
    • http://ms-domino.eu/images/file/files/tizumosinagowokati.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021080409530311.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2243c19172---wijis.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/98933959926.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/ecfb7e75080eb9cbd41d23ea72d77be8/82424711429.pdfIn PDF document text
    • http://chemicalengineers.ie/images/xowafadexelirufafupi.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/rm54bnbpvc0tjokeur1ab5rdpm/16842346808.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_off0000ccac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAC 16984 bytes
SHA-256: 3c5773c1799c5540dd3b82e99c587c78af0ed8385683a62dbb1a90c66fc9eaff
font_01_sfnt_off0000f7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C4 10468 bytes
SHA-256: b3ca918892ba9d9fe36178399fae7a993dcc3750908868642d463b8817a7993d
font_02_sfnt_off00010fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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