PDF malware analysis — malicious · 73fa3a5bb8f8135f

MALICIOUS

PDF

89.7 KB Created: 2021-08-10 23:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: 17150a4701e123e1fc08c30b66ef7f5f SHA-1: a36113d0f376117df551247e7fc4477b74034ae8 SHA-256: 73fa3a5bb8f8135fd8ea260189a2499d254f3c8725c8eb5f9a78538ac3499292

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs, while numerous, do not form a coherent document body, reinforcing the interpretation of the file's primary purpose as a lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9932

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798b948456d---46075463187.pdf In PDF document text
- http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e1a729f2d---ragavozavufopu.pdfIn PDF document text
- https://infotechb2blite.com/bot/ckfinder/uf/files/58898306593.pdfIn PDF document text
- http://falegnameriacastiglione.it/userfiles/files/xipasez.pdfIn PDF document text
- https://aljazeerahpetroleum.ae/userfiles/files/biduduf.pdfIn PDF document text
- https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092fce97f6fc---bevexem.pdfIn PDF document text
- https://pharma-tools.eu/galeria/file/daxatiwivimuvewojipu.pdfIn PDF document text
- http://elesi.eu/fichiers/files/25515209807.pdfIn PDF document text
- https://infrastone.com/userfiles/files/51002586356.pdfIn PDF document text
- https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/d4d8532d8261a4de2ed7e596b6f7d43e/9503495735.pdfIn PDF document text
- https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a47162afadf---dijen.pdfIn PDF document text
- http://www.adarshvidhyasankul.org/userfilesfile/27344905225.pdfIn PDF document text
- http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3502a07d7---gidoxogidi.pdfIn PDF document text
- https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/q85rcl1lnr95djj8cdg5p5kv5b/nafemazubet.pdfIn PDF document text
- https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ce24f04f7---rageweto.pdfIn PDF document text
- https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c527a1b3769---xifuponejalobasotuso.pdfIn PDF document text
- http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160da1e380ba5c---94948707232.pdfIn PDF document text
- https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/406880576fc8559c7968e97a6adae1a2/84357558663.pdfIn PDF document text
- http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd194c04e7---26138125313.pdfIn PDF document text
- http://korea-seals.com/ckfinder/userfiles/files/jozikudexunesixarepafo.pdfIn PDF document text
- https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1a6b2a4af---1170486571.pdfIn PDF document text
- https://n-zvuk.ru/upload/file/79408375701.pdfIn PDF document text
- https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160758c2088b06---57906826559.pdfIn PDF document text
- https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/5c4cd2774d73f1307e1a1a6d56c1cc0c/6458878849.pdfIn PDF document text
- https://maisonforville.be/documents/file/xiletakuwokog.pdfIn PDF document text
- http://saigondome.com/uploads/userfiles/file/19473138922.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+much+do+jcpenney+payPDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000fa9a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA9A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000112b1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x112B1	10696 bytes
SHA-256: `9220eef2c711f4d7745663c73b2ea2a4efc0d9661a3b70dda78a5dc444294c7d`
`font_02_sfnt_off00012b14.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12B14	17148 bytes
SHA-256: `2dfd943d3d9e7034f5adb82f2b3a582bff70c9de049f1b0366ff806a9533ceaa`

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