PDF malware analysis — malicious · 1db1cff24210ecdc

MALICIOUS

PDF

88.1 KB Created: 2021-07-01 18:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15

MD5: 102b830b5fc3a4a76c25c6cc2d887c75 SHA-1: 2c65fb69980dd7592789d44b167f17531a1f08e8 SHA-256: 1db1cff24210ecdcfb5b4f470d4941014ed1aeb0e4ec908c223ec196a5414654

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links hosted on compromised CMS sites, forming a link farm likely designed to redirect users to phishing or malware distribution pages. The presence of urgency lures further supports a phishing or social engineering attack vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9952

Heuristics 7

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.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e0d7f2e11---fesatujagemujuza.pdf In PDF document text
- http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c730446f433---jozidovika.pdfIn PDF document text
- http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d1c96727a---gobukajiz.pdfIn PDF document text
- https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16096b59e9f59c---duwavu.pdfIn PDF document text
- http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/3717532046.pdfIn PDF document text
- http://macabrey-luthier.fr/data/Files/wiwelezawenas.pdfIn PDF document text
- https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16079b4cb12518---80392527881.pdfIn PDF document text
- https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/3flluhsemqrqkguiqmqbdoui2h/9029226776.pdfIn PDF document text
- http://kaies.cn/upfiles/file/tudagisoperizo.pdfIn PDF document text
- https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/e9838a6c9ba18e22788868b3bca3c4d9/nakogowitamipefimaxil.pdfIn PDF document text
- http://iphysiology.ru/upload/fedipoxakopazokawuwexef.pdfIn PDF document text
- https://sieuviet.net/webroot/img/files/82369455107.pdfIn PDF document text
- http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c147d28629f---pezoxebivanumolu.pdfIn PDF document text
- https://rivaflo-south.in/userfiles/files/63000566627.pdfIn PDF document text
- http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160701e686d951---wisolalides.pdfIn PDF document text
- https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/0pretbnovoe4qr8p0gpag5161l/zudikixomof.pdfIn PDF document text
- https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/0v7rai7stjlv86lqtcjav2obj9/3293117919.pdfIn PDF document text
- http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0b5857799---23489163978.pdfIn PDF document text
- https://alice-immo.com/userfiles/file/bimofoxajo.pdfIn PDF document text
- https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22d555922e---zenuwokenawamekonipavero.pdfIn PDF document text
- https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/00ed8da639c067aeae3291da83815b02/34674264115.pdfIn PDF document text
- https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/ik6cgb1c0ocmojqenv5t06q2pl/22115821234.pdfIn PDF document text
- http://alpha-th.com/userfiles/file/87802631803.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=free+pdf+to+excel+converter+softwarePDF 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_off0000f405.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF405	17348 bytes
SHA-256: `782e990d5d30e5494825f9ad47bc5911f2d70a3d228424a17b053b9d4a266680`
`font_01_sfnt_off000121fd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x121FD	10752 bytes
SHA-256: `ef8d1eaa77b037fcd11d15c144f7c5f5f22c6dc9faa822f86804a63cc5e24901`
`font_02_sfnt_off00013af0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13AF0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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