Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a56d3e3f5a19fd8…

MALICIOUS

PDF

68.5 KB Created: 2021-09-27 09:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 602f760490e41d4bba9912a7b87e6379 SHA-1: c637a094edf894174ba59d064bf225363f21b343 SHA-256: 1a56d3e3f5a19fd86316ebb328db75306bf796c9dece5216e59dfb043e9c3c35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, indicating an attempt to redirect users to malicious content. The presence of numerous unknown URLs suggests a broad campaign to distribute malicious files or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://tichdiem.surecare.vn/uploads/userfiles/file/kivituxawix.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/so0771a4vnvim8t2028navt2vd/82430789224.pdf
    • http://coming-c.com/userfiles/file/fuviwibezi.pdf
    • http://digivideos.net/ckfinder/userfiles/files/zedutod.pdf
    • https://dawnraytech.985.tw/data/file/userfiles/files/kimenulutum.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614818d5da434---46447458211.pdf
    • https://makenie.com/upload/files/nopumulatebuvoniwisunejo.pdf
    • https://jjcfurnituremaker.com/userfiles/files/woguzojuxikuwewadej.pdf
    • https://accidentmatters.com/ckfinder/userfiles/files/xorotonapem.pdf
    • http://abcgsgeds.friendship-match.com/upload/files/63736725029.pdf
    • http://caythuocnam.org/images/files/rupenijutemiratomu.pdf
    • https://erdenet.mn/userfiles/file/9447656603.pdf
    • http://toyteepee.com/uploadfiles/file/210907210829061208zkfais.pdf
    • https://crbz.ru/userfiles/file/37893039963.pdf
    • https://ngoctraithaibinhduong.com/uploads/news_file/5934934598.pdf
    • http://cyc.cz/pictures/clanky/files/kavagusulunuvovorotiku.pdf
    • https://alubiasdetolosa.com/files/galeria/files/68356493798.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b4699832a---lujezabatozesa.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/8a60557309fb72dab5397853a140a679/pajexitemukozunurijusilu.pdf
    • http://straps.by/ckfinder/userfiles/files/sekofisopexufabuvibawar.pdf
    • http://cnwt.mgo.cool/upfile/files/2021/09/01/daguxef.pdf
    • http://magendans.com/imagefiles/file/dowerumaju.pdf
    • http://cdenito.net/userfiles/file/47649630898.pdf
    • https://irantruck.ir/data/file/parikekuxavozebe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=csr+classic+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aff2.bin
fc4cdf7479dceafacba9d81511e63eb4a094e3a2812b6b809fc8a2e46be88577
pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF2 15188 bytes
font_01_sfnt_off0000d69f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD69F 16792 bytes
font_02_sfnt_off0000eeb6.bin
00f445fe2520ba38a167cb5855cd0ade9b92ced1f60f7fb2e4b5f22f975a9e24
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB6 10036 bytes