Malicious PDF — malware analysis report

Static analysis result for SHA-256 880a655ad7a38572…

MALICIOUS

PDF

88.3 KB Created: 2021-07-05 01:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 59d4a863aa787ba8d62658e37cc2d8e2 SHA-1: 928eba0f7e73ab0ff250c614f87f9836eff56f9a SHA-256: 880a655ad7a38572f162f1064d5c315b2f9fa2f43671f5160f1ab6c3bf93c6aa
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the nature of the links suggest a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ketchas.ru/uplcv?utm_term=shaken+up+meaning
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727eef7bfc8---jujixubogigireduso.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/bdb1956a43e9e75e2829e69a903e1724/1862155077.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/krnkje9s40l2r28l6u9ms7aie4/zatexajosipezitenekum.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/55ca652329993cff1760f6325e2ee93d/vixakedamaropuris.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/g43ekujep0vri0442jcq32mtju/joxojejufaxowuletalotokas.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/tu0i031ki7i0n7i2m7j5nkfg83/luxesitovejivuju.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608338559978b---60698884785.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1684973ede---86771575605.pdf
    • http://ctkupavna.ru/upload/file/wuxoxodopejoxi.pdf
    • http://accessiblevehicleservices.com/userfiles/file/42976270512.pdf
    • http://france-ex.com/images/blog//file/36521304476.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d36cc540a---vedolutiwiduzepinin.pdf
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/6c221ad5e2b9cfa76107bdcd27ba91eb/68318189368.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df1f06bd54---kozudexavaja.pdf
    • https://memoservicesrl.it/file/xaratuz.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160828113ec323---sirazatiluz.pdf
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/lipububokokijesutugonuf.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/944fbaa83d34f61ce36ac1bb84da6b7f/70928904095.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609844929f528---direwuxapepogibezetili.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/51cebb3e12314fae6407055f275cd022/51054039827.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c72315acec1---98588581496.pdf
    • http://rocb-ap.org/file_media/file_image/file/xivekemeputafusetepowepoj.pdf
    • http://oreade-breche.fr/userfiles/file/90647662413.pdf
    • http://pogotowienaukowe.com/Upload/file/pemikadupozawida.pdf
    • 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_off0000f0c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C3 16792 bytes
font_01_sfnt_off000108da.bin
73d84ebec5416a1501e240733e523a007730efe2e409020822efbb202e0604b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x108DA 10432 bytes
font_02_sfnt_off00012046.bin
27279257060095ce807c5c4e887e39f6626776aaff75d0b1785d1ce0e54f0730
pdf-font-stream PDF embedded font (sfnt) at offset 0x12046 19120 bytes