Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ae1b5bb3033c4d9…

MALICIOUS

PDF

74.0 KB Created: 2021-09-20 10:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 728e52275c74dfbcaf5f46dd5e071cf3 SHA-1: 2b96d220944c5e8d43114c54b34f644ec0d2c855 SHA-256: 3ae1b5bb3033c4d916a0fd893133bc175db6db7c29a4b9691f92d4f8724d6348
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to trick users into downloading a malicious file. The presence of a download button lure further supports this. ClamAV detection and ML classification confirm the malicious nature of the file, likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://physio-praxismitte.de/userfiles/kawimilizilesaruwig.pdf In PDF document text
    • https://lee-trading.tw/archive/upload/files/62898820117.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/jenedovepumalova.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/a09434f0b04f8374399b14ecef17cc34/gixifemadefi.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/64663144924.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16147f6a910bfc---luranelarorirojusa.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/61452018108.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/19947119279.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/21574432890.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/71831758132.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210914005828.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/zififaxej.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/nopexiwovazutaxajuwi.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/92001113391.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/qdhgcfnkmv7u3h6ovm3c583km8/sewexafapobinep.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///jolavudewupejomuzovagiza.pdfIn PDF document text
    • http://canvangdientu.com/images/file/ronifiguresa.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147df59b0376---dulakipu.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/9419813392.pdfIn PDF document text
    • http://noclegsosnowiec.pl/eurostyl/photos/file/wiguxuvosenezexadejuz.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/fufowop.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/48580222271.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b34d8a62af84ec2979145d4dc309ef8d/2559676573.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/vowoxitiforekokufame.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=ben+10+ultimate+alien+vilgax+attack+game+download+ppssppPDF 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_off0000b996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB996 17572 bytes
SHA-256: 5e2d5c7235600c6e9b354cda8db24bc145ec9a759f8881c9152c835d48801766
font_01_sfnt_off0000e75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75D 11428 bytes
SHA-256: 16e5a335d813957d8e0c455e134cb29a7327dbf1c3940a075445b0e03fcffd79
font_02_sfnt_off0001024a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1