Malicious PDF — malware analysis report

Static analysis result for SHA-256 644c7f7b9527f0c2…

MALICIOUS

PDF

87.2 KB Created: 2021-07-04 02:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2cf9c497e129d56b5ea0a7850c01681c SHA-1: 68387a282e926f01afb3fd7a6626920653547cb6 SHA-256: 644c7f7b9527f0c26193c2f5766467d81f0ee655e6c4a3b77b44f6e4063f9a44
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It contains a link farm pointing to multiple compromised or disposable hosting sites, likely serving as a lure to redirect users to malicious content. The presence of numerous unknown URLs suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e8a3a7904---30267598926.pdf
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/8m71ct4m8qh30j8f1o5e3dbsdf/88022660963.pdf
    • http://winterwonderlandzundert.nl/uploadimages/files/wuvuxajojepenelomeno.pdf
    • https://hgindustrial.eu/userfiles/files/nejubakabe.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/c921ec9e5e34b6e26ca92b5412132ce0/71670059138.pdf
    • https://majubesar.info/contents//files/24749660914.pdf
    • http://kursadowicz.pl/Upload/file/judodo.pdf
    • http://bloomx.com/sites/all/sites/bloomx.com/files/24298245130.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-5-7/20210507210226421220.pdf
    • https://siam-royal-view.ru/data/files/fumokorujubap.pdf
    • http://chanakyaaerospacedefence.com/userfiles/file/rifobivarapoli.pdf
    • http://lube-stc.com/ckfinder/userfiles/files/varadelexogugene.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b6eecf963bd---tamilalobitejijep.pdf
    • http://adance0112.com/upfile/editor/file/burogejeworedovativewur.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/pep1goatkgqs68hnbulofo950u/48619951450.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9d40b6fcc---rikorumesudofetopori.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a96e8b1c95---31452640451.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160be23c5a836f---tonegavasagekufit.pdf
    • http://lapenya.cat/imgjovesnaves/file/97228239598.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/f40ca1a3507ac1af3cbdf169c7e1d7b2/75323010102.pdf
    • http://annamsaigonlaw.com/upload/files/22213011665.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/a37365ca1166c156ddd6515c280170ac/45941107038.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-5-18/20210518001124528231.pdf
    • https://addsfly.com/userfiles/file/filatumokixuga.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/473be18520a32d1af76ed5d42348e51f/21268104378.pdf
    • https://baxsporthorses.nl/userfiles/file/23325962620.pdf
    • http://amirafouad.com/uploaded_files/file/wogufigakuvategufuvubibu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+much+does+a+broiler+chicken+weigh
    • 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_off0000ef5f.bin
25c73e4ff3bb3fe6a8f29eb2bad50a5d0f6cd93bd16ae37d3bda7beb7b6453e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5F 11128 bytes
font_01_sfnt_off000108ee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x108EE 16792 bytes
font_02_sfnt_off00012100.bin
97faaa879be31ff6c242899cdaf19572935d134cb5d428c25725554e39a7d709
pdf-font-stream PDF embedded font (sfnt) at offset 0x12100 17772 bytes