Malicious PDF — malware analysis report

Static analysis result for SHA-256 790f4f477c51faf7…

MALICIOUS

PDF

99.4 KB Created: 2021-07-28 09:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 27809bee192d609950aa33b52489d359 SHA-1: f8635d7ae2dbb74e6abae020087d256710be536b SHA-256: 790f4f477c51faf77d0fa52ff9582fbb35049ebfd164ff368116a6cb83861ce0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely involving the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b803d4d3a02---13018663147.pdf In PDF document text
    • http://ytbozhuo.com/upload/file/01152946664.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/4bdbkn7t24vofl4pv1ugtmi1n0/redonejadilijiwegapifiw.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/34815815971.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7f982c4f5---61933081667.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ikhrna5upbr9jr704fj6pqjvo3/99233808172.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/delunexaxemaful.pdfIn PDF document text
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/55437269751.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/7610e44ef218003ebcacbd2f9655379c/zegibijap.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/79jb3hnf8672ljt4m6p1jc4nr5/90651436698.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/41352153460.pdfIn PDF document text
    • http://donghotam.com/luutru/files/fopodizulakigugefa.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/dizalazexalusapofamuxol.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/tokafam.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/meladowelamen.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b70c4536817---71683783056.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/tumefozidutebebuladudove.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/rugulakeg.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608524a3e0a1d---xuwuzesa.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/sirif.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/jifavofenebemogenefapu.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d6e6cb877---depupevafijasenabixoru.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/f3be1e505aede78a87ee7c31f0020972/zifabamilusaju.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/tevebanuborixam.pdfIn PDF document text
    • http://sushibelovo.ru/files/91074964674.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=f1+manager+series+4+tipsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001099e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099E 18024 bytes
SHA-256: 0fa488e50ebadc107817b17ac0a06bb3e55599840fc8dbb567956abc134b4c2b
font_01_sfnt_off00013897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13897 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000150a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150A8 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_03_sfnt_off0001661f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1661F 10536 bytes
SHA-256: 83dadc94fae5ceef65e0511f031bb3a97901419121f64886ff9c04e565c05c36

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