PDF malware analysis — malicious · 22b0fd8941f7ef23

MALICIOUS

PDF

81.0 KB Created: 2021-07-31 21:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15

MD5: 30786f181df318d56c1b011539eba620 SHA-1: 2a190fdef5259adbb2f45a8a5bd43551283b821c SHA-256: 22b0fd8941f7ef232e85a749ed7ce24cf99d74718a117aaab831f395f6a5d6d5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9977

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://laborke.ru/uplcv?utm_term=ejercicios+ingles+online+present+perfect+y+past+simple PDF link annotation
- https://oddluzanie.net/userfiles/file/79071556442.pdfIn PDF document text
- http://hzdsbg.com/uploadfile/1621224937.pdfIn PDF document text
- http://bettynblue.com/upload/fck_img/20210513/file/47627066505.pdfIn PDF document text
- http://krakow4you.pl/krakow/files/6152808314.pdfIn PDF document text
- http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9aea63245---76568320973.pdfIn PDF document text
- https://www.colline-eternelle.com/ckfinder/userfiles/files/60164627611.pdfIn PDF document text
- http://nctpa.biz/clients/5/51/51e593b678cc4707ea5ff7b662bcbdb9/File/10371109346.pdfIn PDF document text
- https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/9248df50617fd40d4298929ec57793c5/29934641571.pdfIn PDF document text
- http://studiotecnicobonoli.com/userfiles/files/kofabofakeru.pdfIn PDF document text
- http://tiramisu-o.com/yamituki-n/uploads/files/19921994382.pdfIn PDF document text
- http://b-solutions.net/userfiles/file/63930317907.pdfIn PDF document text
- http://jingchengs.com/jingchengs/ckfinder/files/20210625234433.pdfIn PDF document text
- http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/45778172805.pdfIn PDF document text
- https://bookatowncar.com/userfiles/file/8437347513.pdfIn PDF document text
- http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890658ee99a---vumudajaj.pdfIn PDF document text
- http://kleiberit.ru/files/file/89097184857.pdfIn PDF document text
- https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/ff152cb2d09afac0674c5913ba2e03b5/tewexofavatijaxogodaxen.pdfIn PDF document text
- https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/7b6509c4ad7d622e0c515dca11aebd00/mepusurotifo.pdfIn PDF document text
- https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62496e6190---fekaji.pdfIn PDF document text
- https://sinhadventure.com/uploads/file/91925849509.pdfIn PDF document text
- https://likeevent.it/writable/public/userfiles/file/51501966808.pdfIn PDF document text
- https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/d259ec278c7cd2a4fb42fc16cf0cf6da/38297304265.pdfIn PDF document text
- https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/f71502505c24a5443d04e21fbd5b9bed/31941342456.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d520.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD520	11048 bytes
SHA-256: `4529d0661eaa5268b9588e029c0e442c5813c8e1ce9cae7dbb283b4207acc190`
`font_01_sfnt_off0000eed5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEED5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000106e7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x106E7	17788 bytes
SHA-256: `7d84c2aac38fccd367aa042991b7c6854098508432661a98d3e864b8af9f428b`

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