Malicious PDF — malware analysis report

Static analysis result for SHA-256 e90c00bcac213dd2…

MALICIOUS

PDF

71.8 KB Created: 2021-09-12 14:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 05124545760a34838e5b379ce39c63a4 SHA-1: 53b0384855e05d677c75caf66660105657931331 SHA-256: e90c00bcac213dd21b41818edfdd9dcdd37353cbd9592a7fa0eb903aaab4ce58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, including one pointing to a compromised WordPress upload directory, suggest a link farm designed to redirect users to malicious sites. The use of SEO poisoning tactics is evident from the URL containing 'utm_term=code+for+phone+hacking'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/jiwaguxupod.pdf In PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210906_03011807171D3B9B.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/bukesogixol.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/of9u2341uch2ato6gni737k9nl/rawebejizo.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38757651816.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/68627493986.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/badexedesokekaloliz.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/gotikefagubixebetuwevali.pdfIn PDF document text
    • https://5udua.com/contents/files/50997498923.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132c959b327c---17809491074.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/2057208318.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/wewexatu.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/nesagominijugigufuwilabej.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/17200838373.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/18434975270.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2932a99b1---lileze.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a52b52e1a3---18607185276.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/4342466864.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/sokebobafujaxepe.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/fazitonapi.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/fagurilek.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/57073676964.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/53400965276.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/59069117783.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/bifuvurenevebibuvomexe.pdfIn PDF document text
    • http://hotechike.com/files/files/92197336331.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=code+for+phone+hackingPDF 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_off0000ba55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA55 15464 bytes
SHA-256: ce18b4a81a1d604b8c1323de4cafcc15fe99b594331952927f4877e9a700d955
font_01_sfnt_off0000e17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17D 10712 bytes
SHA-256: e56a0d5808bf57fd135af5defbf23cf9c141503060d2acdffd8c561060e2e06d
font_02_sfnt_off0000f9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1