Malicious PDF — malware analysis report

Static analysis result for SHA-256 922198509c50e0bf…

MALICIOUS

PDF

70.2 KB Created: 2021-09-24 16:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e5c7eb408600e06abc8b4ea25b5d740c SHA-1: bd3e32d76b3befcd0bc719088564fd1569694fdd SHA-256: 922198509c50e0bfeeca48d89d87d6a096edcfd54e35c012413728231e52b526
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are characteristic of a spearphishing attachment designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://sushinamu.com/uploads/files/mogelulanufikulomafataf.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3d5c5060d---rarisojalikigijadopi.pdf
    • http://tfe-design.dk/userfiles/file/nojejisiwape.pdf
    • http://bellamy.tw/uploads/files/202109070848556441.pdf
    • https://harkakotony.hu/UserFiles/file/51822130802.pdf
    • http://mosjob.ru/images/file/xisawo.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a80b2ed49---rapewuv.pdf
    • http://gernano.eu/gfx/userfiles/files/nakozedojazumumutov.pdf
    • http://komputerzagrosze.pl/userfiles/file/sarelubisezozovasavabupi.pdf
    • http://rjt1.org/upload/files/97959504180.pdf
    • https://isitekmuhendislik.com/userfiles/file/pojufiwomeremenibazaxore.pdf
    • https://zlato-eu.cz/upload/files/80715648851.pdf
    • http://studioriboldi.eu/userfiles/files/23398921506.pdf
    • http://tamker.hu/userfiles/file/josemuziwor.pdf
    • http://piscesappliances.com/userfiles/file/toriwijog.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161337fc74fde0---kofedef.pdf
    • https://salonrewards.ca/images/file/mijibitil.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614239d664579---97189602084.pdf
    • http://lulanjina.net/upload/files/zetorudajimumubogotuvokid.pdf
    • https://adepotcustom.com/UploadFiles/file/20210906080604167.pdf
    • https://grupa-energia.pl/attachments/file/zopetaralegepe.pdf
    • http://tuyothuyluc.vn/webroot/img/files/vobugixigep.pdf
    • http://ambulatorioveterinariocigliano.com/userfiles/files/vakuvupujujogipipiladupaz.pdf
    • http://matraholding.hu/images/userfiles/files/27783552405.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=rotation+90+degrees+counterclockwise+about+the+origin+worksheet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b30d.bin
520520c36e97dc0b18c530f04bf8699e2ec17335e2361079e57fd56c83a72644
pdf-font-stream PDF embedded font (sfnt) at offset 0xB30D 11404 bytes
font_01_sfnt_off0000cdbb.bin
619726d52796890562a49bc916ca21c8be9bacb72dbe47a1a0f2351388c5583b
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBB 14660 bytes
font_02_sfnt_off0000f216.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF216 16792 bytes