Malicious PDF — malware analysis report

Static analysis result for SHA-256 f894544dfbe374cc…

MALICIOUS

PDF

83.6 KB Created: 2021-09-19 15:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8f8d5cd210f26337ea4afbdb6d7bc649 SHA-1: 42f7db8bf807357c0dcd9bd8910a1b5f2057a842 SHA-256: f894544dfbe374cc036210515c6d02fdbcb9ed5e43d6ecdfb24ef6fbf1745d97
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised CMS uploads or disposable hosting, forming a link farm. The document's structure and URL patterns suggest an attempt to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pixomot.ru/uplcv?utm_term=how+to+root+an+app+on+android+phone PDF link annotation
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/72ec04e784332b6443db473f7bcbebd3/jiwilavelan.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/gipavewagadizubiv.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/18ipkngcv4l4q2273ontrb6a42/togituzon.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/duxoliwelubupanaxefef.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/fositutumasuguwe.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c110259ec7---40152529392.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/givojojen.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/vabamego.pdfIn PDF document text
    • http://hanifeugur.com/image/files/kejokexudabuzoxedepovade.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/kugesabakox.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146a96a72836---garoramuzatomutakosudon.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145eef3639c3---52655667007.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/kafumik.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109181609241220.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/wanekufovokavutod.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/fanulipivenogo.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/xumoxugafonejodaratinu.pdfIn PDF document text
    • https://thietbigas.net/media/files/xafopolefipu.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/8668492552.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/meletukarezeparun.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_off0000e543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE543 10352 bytes
SHA-256: 798c17b9139c2e374e5e36a236daeaf0c97e8a94cbf494c99bcf416778473b80
font_01_sfnt_off0000fc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A4 17192 bytes
SHA-256: d1c368fa9abe1ba60a5ec90344c54ad22d4a5f28da9348d1ed3bc29053ae24c6