Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec68e3315977118…

MALICIOUS

PDF

67.7 KB Created: 2021-09-20 20:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 44eec2e51fb956cb4432f12c59bf5790 SHA-1: 569ce9a34f854f95d4188ade6dfdcee467fe92b0 SHA-256: 8ec68e33159771182c35e5c546fb5482f190378bb2074571a736b94beac6618f
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains an image-based decoy and numerous links pointing to external PDFs hosted on compromised websites, suggesting an attempt to redirect users to malicious content. The presence of embedded JavaScript, though not directly analyzed for specific actions, further supports the potential for malicious behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • 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 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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1630767761.pdf In PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/wufuvalumobebelazur.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/91579888032.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/84648542406.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210906034518.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/6720209bc3b587ace664f51861edea33/78288476445.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/bidonezerokurigirajojalo.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/27880849906.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/86799415267.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/gogupixodiroxumuk.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/fosekibed.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/35cc7d7b52523e3ef67845c7746e76dc/51980104615.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/65008938081.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614876b331cea---zolibafubaresunogakilogu.pdfIn PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/90206499818.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/lofagomemukomolabopus.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/gunofegadedixatowoku.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/sowurivid.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/97333886833.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/tidejuzelaz.pdfIn PDF document text
    • https://cardolf.ro/files/84182732607.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161430114574df---gijederulisewozogew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=wikiloc+premium+apk+fullPDF 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_off0000ad1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC52E 14264 bytes
SHA-256: 1f8728638c163f69680fa22ec49f3e9f29fd5893de606d0d377b36ebc11356f5
font_02_sfnt_off0000e88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88F 10456 bytes
SHA-256: e8d750db840f9f8b8ac5d691d0973c5b9631958b566ad5d43efb9c704ea9c2ae

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