Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f71887a93a94dc…

MALICIOUS

PDF

80.6 KB Created: 2021-09-05 01:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 45a4076627a2fa2454b94245532b80d9 SHA-1: 0f2c3581fdc19e286798ca045b0da11b157e3adc SHA-256: 37f71887a93a94dcd6a4d4901fb63dff62b781c19f4e820104e21048f29dfa5b
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's used to distribute or host malicious content. While no scripts were extracted, the nature of the URLs and the detection suggest it's designed to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.klimavill.com//data/editorfile/winuguf.pdf
    • http://nieruchomosci-swidnica.pl/userfiles/file/24412864036.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8ffc67968---riwasuze.pdf
    • http://savvyais.com/userfiles/file/55058427797.pdf
    • http://aweibel.com/Photo/file/11614910340.pdf
    • http://offerseir.com/basefile/offerseircom/files/geradilugafe.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/941f5345989cafb41e9b2462a9d1a25b/delexinotekojeguwewe.pdf
    • http://moscowprice.com/content/xuploadimages/file/29254401576.pdf
    • http://helloshoppingnepal.com/userfiles/file/xesusosodiduvi.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608699a8863df---serosetu.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/a3c2n6f1li2s80r6i50crhkrtg/84062914936.pdf
    • http://xn--xhq021fvrwdth.com/d/files/loruki.pdf
    • http://btc-ltd.com/upload/file/dujizijadinewejuwibot.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/e0424486ea39d57bbcb95131dc861d14/11389290897.pdf
    • http://aihyang.com/userfiles/file/56304854158.pdf
    • https://alperbehang.nl/userfiles/file/48607696804.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f370a71391---51751661562.pdf
    • http://sushibelovo.ru/files/29575621570.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/719bdee5f2b178d9a9f1c04ffce1d233/funefetalun.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/1ed2kvd4gjnv1qvv7hdo3b1bu3/laroxamonuratumidit.pdf
    • http://ahdongjiu.com/upload_fck/file/2021-5-12/20210512102817394720.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607a55c08776c---79423106541.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d2a1392b4---49947793853.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=importancia+de+la+quimica+en+la+vida+diaria+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_off0000d594.bin
02d18b9d8072f37b5a9c1955529f59bdea0bc7512c437133e83c7552dd9302c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xD594 18008 bytes
font_01_sfnt_off00010373.bin
ba7e53cae9f11bcd0407d507b2bca0469de6a6430ccb7868a28d2f689d835093
pdf-font-stream PDF embedded font (sfnt) at offset 0x10373 10876 bytes
font_02_sfnt_off00011c53.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C53 16792 bytes