Malicious PDF — malware analysis report

Static analysis result for SHA-256 aebc216dc5652051…

MALICIOUS

PDF

88.9 KB Created: 2021-08-19 15:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b63f33ae3c74fb7291f27702dc7a0cbf SHA-1: e084320e62dfd55d65ca0c3b618a751752777d02 SHA-256: aebc216dc565205115d7e8197f1a7de2b406a92e586b18ef4521ed5c616bd805
196 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to compromised CMS upload storage and disposable hosting, indicative of a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and the overall structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/0a93ed201a3d4161b5c1ef244bc31f87/fetupigigikusobulati.pdf In PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/siganonuvuximivilazidevis.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/32999842816.pdfIn PDF document text
    • https://dintek.eu/uploads/file/45694634407.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/fojetut.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd776b7ce8---37846029575.pdfIn PDF document text
    • http://adikkedua.com/contents//files/lizozedugalev.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e45c1661aa---viferimazorukol.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/b8d312abb12a918eb44cb53331df25fd/viralowajakozobi.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/darusunemunifu.pdfIn PDF document text
    • https://partnermind.cz/images/files/moposowujofuromu.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/taxulokijujebof.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/63721713308.pdfIn PDF document text
    • http://azs-szermierka.pl/zdjecia/fck/file/dikunezum.pdfIn PDF document text
    • https://citronel.com/userfiles/files/93890936922.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/20090112083.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/an9drgnao80fb5aeb0liltg7or/zopovif.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/janusikavexazobaza.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/bba43e8fb1cb5435769f96cf9ed5e4df/83250853911.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/regowobojogosobujifoji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=spanish+music+download+sitesPDF 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_off0000f704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF704 16744 bytes
SHA-256: d07ecf830b8a508b7a2cc825d85598e09553a57ba8ad925c1fe3a91df0f35fb5
font_01_sfnt_off000122b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACC 10940 bytes
SHA-256: 0eee25acc33b27c2e42250cc8914af4d42e627af920afdb075b0608a29f9529c

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