Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b59d516b6e7874…

MALICIOUS

PDF

72.6 KB Created: 2021-09-22 09:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 89c5542728c2adb2bc999d6d293cc422 SHA-1: 301bea5e8250e2c37505bcc7fc063ac1796f7fcb SHA-256: 90b59d516b6e787492d0d8bc5356cc0dc122549700d784f5ef8fe12763dcf60e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. These links are likely intended to lure users into downloading further malware or engaging in phishing activities. The presence of external URIs and link farm characteristics strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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+youtube+para+mp3+android+online PDF link annotation
    • https://gplacestracker.com/userfiles/file/90483861127.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/613b9fc5e0f93.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/69403282618.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/gufigawoxotimajazujixiji.pdfIn PDF document text
    • https://reha.bg/content/upload/file/6017076599.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/fikoxidenubus.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161353761a4d97---mejuluw.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/528d5deb79f4368729e842cf809cfe78/bedadusoludemedas.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/fidurut.pdfIn PDF document text
    • http://standdominica.org/files/files/14350153501.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109111505197766.pdfIn PDF document text
    • https://autoskola-scp.com/files/17037611942.pdfIn PDF document text
    • http://cichanski.com/Upload/file/majelubudotinefebozet.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/ruxije.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613213d4ad58c---14024055359.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/lifiro.pdfIn PDF document text
    • https://wecareprogram.org/images/file/4699020810.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/34363030371.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/ginoliv.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/repiminogonaduzozowunaja.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/82476223896.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/zirubirasunojonukogunop.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_off0000b984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB984 11008 bytes
SHA-256: e6bdb9ccb7c20e4bd86bdca16d587845cf8adbdde505230c65df8f0e1a4d68c5
font_01_sfnt_off0000d2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E6 16120 bytes
SHA-256: 17cafc9c2384ab78d096029823da3046136891c2089813a7baedeaf8571cc6f1
font_02_sfnt_off0000fc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1