PDF malware analysis — malicious · c2cb63834ae7e951

MALICIOUS

PDF

93.3 KB Created: 2021-08-10 23:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: e79f9e281985e2854cf4ba96426a5adf SHA-1: f032f3edbd22bf723cd786197e417f9672cd9cc4 SHA-256: c2cb63834ae7e95122d7032eee01e88e6cc1b8d131e55430c6e83948caf9709d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The `utm_term` parameter in one URL indicates a potential SEO-based lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9930

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://archism.ru/uplcv?utm_term=internet+gratis+para+celular+personal PDF link annotation
- http://kfnmsz.com/upfolder/e/files/20210719152555.pdfIn PDF document text
- http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/uti83qd70m8ndk8tq29lcca201/bivijokarusu.pdfIn PDF document text
- https://santevita-bg.com/ckfinder/userfiles/files/bobejugigebenogebomamo.pdfIn PDF document text
- https://weborder.cloud/userfiles/file///9157682649.pdfIn PDF document text
- http://cosonhuath.com/hinhanh_fckeditor/file/rizojiriwep.pdfIn PDF document text
- https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e902eee2175---51748629859.pdfIn PDF document text
- https://auto-rujo.com/images-editor/file/fiwiwiwigivixaduni.pdfIn PDF document text
- http://www.companyforte.com/imagenes/editor/file/50032705413.pdfIn PDF document text
- https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/uo2gh4dslr54oe8h0na64hci6s/37841612779.pdfIn PDF document text
- http://worldprint.su/userfiles/file/jufajowabikerevug.pdfIn PDF document text
- http://fresh-j.info/images/uploadedimages/file/vezapajop.pdfIn PDF document text
- http://amdind.com/userfiles/file/giluwevu.pdfIn PDF document text
- http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b5e80f1f0---bitimevo.pdfIn PDF document text
- https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c418d5700---rivolasu.pdfIn PDF document text
- https://thietkevuphong.com/uploads/image/files/bepegizeride.pdfIn PDF document text
- http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160780bbb07c52---sikidusixufof.pdfIn PDF document text
- http://gaongonmaiphuong.vn/webroot/img/files/8245675888.pdfIn PDF document text
- https://didacostruzioni.it/userfiles/file/roruli.pdfIn PDF document text
- http://dongsimkindergarten.com/upload/files/metasajegejuber.pdfIn PDF document text
- http://tobn56.com/UpFiles/file/samenokegajopofubatotawu.pdfIn PDF document text
- https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/hro3a6gtnls7j1rrrah6b5iqbq/voxakomenimetukij.pdfIn PDF document text
- http://ctyrkolky-gamax.cz/data/dokumenty/5144606423.pdfIn PDF document text
- https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/vamq8fmh4ru1bo6bd74cefuuon/43419022902.pdfIn PDF document text
- https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/5659259f1e98a0f7df4398c8fb590625/54694638481.pdfIn PDF document text
- 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f08f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF08F	16312 bytes
SHA-256: `7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae`
`font_01_sfnt_off0001069a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1069A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011eb1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11EB1	10600 bytes
SHA-256: `32b923bb84d49640c06d99c9fc42c0057e0416a4695aec9c53179cf921fe8eec`
`font_03_sfnt_off00013709.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13709	18312 bytes
SHA-256: `b32d8be804c0fdfbdf3336392d2d5a60ddab91554d7a3d874be9350884e6f2ac`

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