Malicious PDF — malware analysis report

Static analysis result for SHA-256 592ed7712401925d…

MALICIOUS

PDF

94.2 KB Created: 2021-09-19 02:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 629b12357cc05045eb2f4a6d08ffd3fe SHA-1: 9f253d3ba4f55b939cfdfbc8b240d86bb5d5acd9 SHA-256: 592ed7712401925d7dd5b8b38fb933cf8086b020c2cd59daf1d645c83eaa7e89
196 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress uploads and disposable hosting, indicating a deliberate attempt to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The document body was unreadable, but the heuristic firings clearly indicate a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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 https://wangwangcamp.com/uploads/files/202109072314096204.pdf
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/powepobolifubasapejorisi.pdf
    • http://tmkb.org.tr/ckfinder/userfiles/files/zubixiseritetod.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6141a4efa---tufukorepipofuvuk.pdf
    • http://circuitoinsulargc.com/documentos/file/25206159546.pdf
    • http://location-appartement-venise.com/italie_documents/files/lufizuzufi.pdf
    • http://holidayservicemarsala.it/userfiles/files/tapaluzo.pdf
    • http://german-ex.com/images/blog/file/xifudatomikeladatuvob.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/kkcctacuib8rv09fjj7bkvrcqp/zasalaxikuximasasatuzaxa.pdf
    • http://haokunchem.cn/upload/files/wugedo.pdf
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/33652067691.pdf
    • https://efnnma.org/files/file/69465557366.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/25104482889322c76443a93fc8d2ccfb/37199032681.pdf
    • https://vialivonica.eu/userfiles/files/89165549589.pdf
    • http://hoshitorionline.com/uploads/files/94809404748.pdf
    • https://childrencareandliteracysociety.org/userfiles/files/13049539693.pdf
    • http://irvinenott.co.uk/ckfinder/userfiles/files/49094719135.pdf
    • http://diegogenna.it/userfiles/files/45530514771.pdf
    • https://soportedevida.mx/ckfinder/userfiles/files/dojetinegade.pdf
    • https://giaiphapthietke.vn/media/file/files/13209070991.pdf
    • http://optykglowacki.pl/obrazki/files/mukanevogapukotinejapuwe.pdf
    • https://renhedc.com/uploads/files/202109050959367590.pdf
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/31506141824.pdf
    • http://hkxhjfc.ltd/uploads/files/20210919063203.pdf
    • http://cuboni.com/uploadfile/hong202109140635152362.pdf
    • https://contemporaryteas.in/admin/uploads/file/35907563393.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=resident+evil+5+ppsspp
    • 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_off00010684.bin
43db9133e563eab7be9dc4b31f27714d5273e60f44f10d0dc0137e8819c35512
pdf-font-stream PDF embedded font (sfnt) at offset 0x10684 10248 bytes
font_01_sfnt_off00011db0.bin
ab8ad7be971800220e827db9c40865552f27fbf485fb3f76490b75b470b39a47
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB0 20200 bytes
font_02_sfnt_off00015313.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15313 16792 bytes